Koma Japanese spinning tops with a winding string

Koma: Japanese Spinning Tops, and Why the String Is the Whole Skill

A koma looks like it should be simple: a wooden top, a length of string, throw it and it spins. In practice most first attempts land flat and dead. The reason is almost always the winding, not the throw.

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Written from Tokyo. We are a Tokyo-based team sourcing Japanese candy and DIY toys here in Japan. Koma turn up at New Year, at school events, and on every dagashi shop toy shelf, and they are the toy adults most consistently underestimate.

What a koma actually is

A top with a metal or hardwood tip and a body wide enough to carry momentum, thrown using a string wound around it. Unlike a Western fingertip top, you do not spin a koma by hand. You transfer the energy stored in a tightly wound string into rotation, all in the instant the string leaves the body.

That is why the winding matters more than the arm. A loose or uneven wind releases unevenly, and an unevenly released top wobbles, tips, and stops.

The main types you will meet

Wooden

Kigoma

The standard school and festival top. Forgiving, easy to see what you did wrong, and cheap enough to lose.

Metal-rimmed

Beigoma

Small, heavy for its size, spins for a long time. The traditional battling top, played inside a barrel with cloth stretched tight over the opening.

Battling

Kenka-goma

Any format where tops are thrown into a ring together and the aim is to knock the others out or simply outlast them.

A note from Japan ๐Ÿ‡ฏ๐Ÿ‡ต

The part nobody explains: you wind from the tip upward, keeping every turn tight against the previous one, with no gaps and no overlaps. Gaps mean the string accelerates in stages instead of smoothly. Overlaps mean it snags. A well-wound koma will spin from a gentle throw. A badly wound one will not spin from a violent one.

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How to throw it

Your koma game plan

  • Wind tight, from the tip up. Keep tension on the string the whole time and lay each turn flush against the last. This is the skill. Everything else is secondary.
  • Throw sidearm and level. Bring your arm across your body and release parallel to the ground. Throwing downward drives the tip into the floor and kills the spin.
  • Pull the string back as you release. The spin comes from the string unwinding, so the hand holding the string end pulls back while the top goes forward. Beginners let go of both at once and get nothing.
  • Use a flat, hard surface. Wood or concrete. Carpet and tatami absorb the spin immediately, which is unfair to a beginner and to the top.
  • Expect to fail for a while. A koma is one of the few traditional toys where nothing partial happens. It either spins or it does not, and the gap between those is a few days of practice.

What koma battles are decided by

In kenka-goma the winner is rarely the strongest thrower. It is whoever spins longest and lowest. A top thrown hard sits high on its tip, travels around the ring, and gets knocked out. A top thrown smoothly settles, barely moves, and is still going when the others have stopped.

That is the whole appeal, and the reason it survived as a New Year game for generations: the child who throws hardest usually loses.

Frequently Asked Questions

What is a koma?

A koma is a Japanese spinning top thrown using a string wound around its body, rather than spun by hand.

Why will my koma not spin?

Almost always the winding. The string has to be wound tightly from the tip upward with each turn flush against the last, or it releases unevenly and the top wobbles out.

How do you throw a koma?

Sidearm and level, releasing the top forward while pulling the string end back, onto a hard flat surface.

What is a beigoma?

A beigoma is a small metal-rimmed battling top, traditionally spun inside a barrel with cloth stretched tight across the opening.

What is kenka-goma?

Kenka-goma is koma battling: several tops are thrown into the same ring and the winner is the one that stays in and spins longest.

Is koma a New Year game?

It is strongly associated with the Japanese New Year, alongside kite flying and hanetsuki, though it is played year round.

Other traditional games Japanese kids grow up with

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