Kunai Throwing Knives: Design, History, and Buying Considerations
Maybe you first saw a kunai in an anime, or in a martial arts class. Either way, you want a set that sticks in a target and holds up to practice, not a replica that bends on the first miss.
This guide to kunai throwing knives covers where the design came from, what sets it apart, how well kunai really throw, and what to check before you buy.
What Makes a Kunai Different from Other Throwing Knives?
A kunai is defined by three features working together: a pointed, leaf-shaped blade, a ring pommel, and a wrapped handle. Most other throwing knives are flat, unwrapped bars of steel with a simpler profile, so a kunai is easy to spot at a glance.
That shape comes from a Japanese hand tool. The history section below explains why that matters when you’re picking a set.
The Pointed Blade, Ring Pommel, and Wrapped Handle
The pointed tip is what sticks in the target. On many throwing kunai, the tip is the business end, and the edges are secondary, so check the listing to see whether the edges are sharpened.
The ring pommel was useful on the original tool for tying on a cord. On a modern kunai, it’s a place to loop a lanyard, and it adds a little weight at the handle end, which affects balance.
The wrapped handle gives you a firmer grip when throwing. On United Cutlery’s Honshu Kunai Set, for example, the handles are wrapped in black waxed cotton cord, which the maker says gives a no-slip grip when throwing.
Purpose-Built Throwers vs. Decorative Designs
A purpose-built throwing kunai is one solid piece of steel shaped for balance and impact. A decorative kunai is made to look like a screen prop and may use thinner steel, a separate handle, or a finish that won’t survive hitting a target.
That gap is wide in this category, because so many kunai are sold as costume or display pieces. If you want to throw, look for listings that describe one-piece steel construction and call the knives throwers, not replicas.
What Should You Look for in a Kunai Set?
A good kunai set has even balance, one-piece steel construction, and a sheath that keeps the set together. Those three things decide how consistently the knives rotate, how long they last, and how easy they are to carry to the target.
Weight, Length, and Balance
Balance matters more than raw weight. A kunai with its balance point near the middle rotates predictably and can be thrown from either end, while a kunai heavy at one end is easier to throw from the lighter end.
Length varies a lot between sets. United Cutlery’s Honshu set, for example, lists a 7 1/8 inch edge on each knife. Longer, heavier kunai tend to feel steadier in flight and are easier for beginners to read, while small, light kunai are harder to throw consistently.
Steel, One-Piece Construction, and Edge Design
One-piece construction is the most important spec for a throwing kunai. A knife with a separate handle fitted onto a short tang can loosen or snap under the repeated shock of hitting wood.
Stainless steel is the common choice for kunai sets. The Honshu Kunai Set from United Cutlery uses one-piece 7Cr13 stainless steel with a partial blood groove, three throwers per set, and a nylon belt sheath with a snap strap. Throwing knives are generally heat-treated to take impacts, so they flex or dent rather than chip. Very hard, brittle steel is a poor choice for throwing.
Edge sharpness is a separate decision from steel. A sharp point is what you need to stick. A fully sharp edge adds handling risk without helping much on the target.
Set Size, Sheath, and Price
A set of three or more saves you trips to the target. A sheath with a belt loop or leg strap lets you carry the whole set and keep the points covered between rounds.
Prices range widely, from inexpensive single decorative kunai to multi-piece throwing sets with sheaths. Sets from brands like United Cutlery are a common starting point for new throwers. A higher price usually buys thicker one-piece steel and a better sheath. Compare the steel, length, and construction listed for each set, not just the finish.
How Do Kunai Perform in Target Practice?
Modern throwing kunai built from one solid piece of steel throw well, and many beginners find their shape easy to read in the hand. The leaf-shaped blade and ring pommel make it clear which end is which, which helps when you’re learning your rotation.
How Balance Affects Rotation
A balanced kunai turns in even, steady circles. A kunai with most of its mass at one end wobbles more and is harder to time.
The practical rule for any throwing knife is to hold the lighter end. If a kunai is handle-heavy, throw it from the handle. If it’s blade-heavy, throw it from the blade. Holding the heavier end makes a clean release harder.
Spin and No-Spin Throwing as Different Approaches
Spin throwing sends the knife through one or more full turns before it sticks. No-spin throwing pushes the knife forward with little or no rotation. Both work with a balanced kunai, but they use different grips and distances.
Most beginners start with a hammer grip and a half or full spin at a short distance, then step back as their timing improves. Competitive formats tie distance to rotation: the American Knife Throwers Alliance rules set minimum distances of 7, 10, 13, and 16 feet for a half, one, one and a half, and two spins.
Where Did the Kunai Design Come From?
Most accounts trace the kunai to a Japanese hand tool used for digging, prying, and similar rough work. Its simple iron blade and ring pommel fit that job well, and it only later became tied to ninja stories.
From Japanese Utility Tool to Martial Arts Association
The kunai’s link to ninjutsu is mostly a story about a common tool being easy to carry without drawing attention. Much of what’s said about ninja and their equipment comes from later writing and popular culture, so treat dramatic claims about the kunai as a ninja’s main weapon with caution.
Historical kunai were also not built for throwing. A rough utility tool with uneven balance is hard to throw accurately, which is why modern throwing kunai are redesigned for balance and impact. The same ninja image gave rise to shuriken, which today sit alongside kunai as throwing stars.
How Anime Influences Modern Designs
Today’s kunai owe much of their look to anime, film, and video games. Pop culture shows the kunai as a sleek thrown weapon, and many sets follow that style, with bold finishes, oversized rings, and colorful wraps.
That’s fine if you love the look. Treat appearance as a second filter after steel, one-piece construction, and balance, since those decide how the knife performs on target.
How Can You Practice and Store Kunai Safely?
Safe practice starts with a solid wood target, a clear throwing lane, and plenty of room behind the target in case of a miss or a bounce-back.
Choosing a Target and Keeping the Area Clear
Soft woods like pine or poplar are a common choice for throwing targets because they take a point well. A target board, a log round, or an end-grain target all work, as long as it’s secured so it can’t tip or slide.
Give yourself room. The World Knife Throwing League recommends about 10 feet of indoor ceiling height, at least 6 feet of clear space to the sides, and about 18 feet of clear space beyond the target, with nothing able to enter that area during throws. It also recommends closed-toe, non-slip shoes and no loose or dangling clothing.
Keep people and pets well outside the lane and behind the thrower.
Handling, Transport, and Local Rules
Treat every kunai as sharp at the point, even if the edges are dull, and keep the set sheathed when you’re not throwing. Check each knife before a session and retire any with cracks, chips, a bent tip, or a loose wrap.
Carry and ownership rules for throwing knives vary by state and city, and they change over time. Check your current state and local laws before you buy, carry, or transport a kunai set.
Choose a Kunai Set for Its Construction
Pick a kunai set built from one-piece stainless steel with a balanced design, a wrapped handle, and a sheath. Compare listed blade and overall length across sets, since the right size depends on your hand and your throwing distance.
Finish and color are fair reasons to choose one set over another, especially if you’re chasing a specific anime look. Make them the tiebreaker, after steel, construction, and balance.
Frequently Asked Questions
Can you actually throw a kunai?
Yes, if it’s built for throwing. A modern kunai made from one solid piece of steel with good balance throws and sticks well. Historical kunai were rough utility tools with uneven balance, and many modern replicas are made for display, so check that a set is sold as a thrower before you buy.
Should a kunai throwing knife have a sharp edge?
Usually not. A sharp point is what sticks the knife in the target, and a fully sharpened edge mostly adds risk when you grip, pull, and carry the knives. Some throwing kunai do ship with an edge, so read the listing and handle them accordingly.
How many kunai should a beginner buy?
Start with a set of at least three. Several knives let you throw a full round before walking to the target, so you practice your timing more and retrieve less. Matching knives from one set also rotate the same way, which makes it easier to adjust your distance.
What is the difference between a kunai and a regular throwing knife?
A kunai has a leaf-shaped blade, a ring pommel, and a wrapped handle, while most throwing knives are flat, unwrapped pieces of steel. The ring and wrap change the balance and grip, so a kunai can feel different on release. Both work for target throwing when built from solid, one-piece steel.
Are kunai knives legal where I live?
It depends on where you live. Rules on owning and carrying throwing knives vary by state, county, and city, and they change over time. Check your current state and local laws before you buy, carry, or travel with a kunai set.
Shop the Collection
Ready to start throwing? Browse the throwing knives collection at Sharp Things OKC, or stop by the N May Ave store to feel the weight and balance before you buy. Orders placed before 3 pm usually ship the same day.
