けん玉はKendamaといいます。Japanese Kendamaと言った方が発祥地が分るのでそれでも良いと思います。
似たものはCup and ballと言うおもちゃなので"It's similar to cup and ball but instead it has three cups and a spike.と言えば伝わると思います。
Ken' - handle
'dama' - ball
It is a traditional Japanese toy
The principle of these toys are the same: catching one object with another, where both are joined by a string
Ken' - handle
'dama' - ball
It is a traditional Japanese toy
The principle of these toys are the same: catching one object with another, where both are joined by a string
けん玉は、英語でもKendamaとして知られています。KendamaのKenはハンドル、Damaはボールのこと。
It is a traditional Japanese toy→伝統的な日本の玩具です。The principle of these toys are the same→こ玩具の原理は同じです：けん玉を持つところに意図で繋がっている玉をキャッチします。
A kendama is often a popular Japanese toy traditionally made from wood but can also be made out of plastic. It resembles a cup and ball toy with the ball on a string attached to the kendama and have 3 different size cups and a spike. The most challenging one is the one down the bottom as it is smallest in size. Objective is to try and get the ball on all 4 sides.
If it has a string, a ball, and a handle to catch the ball with, it is called a Kendama.
For example.
What are you playing with?
A kendama.
Looks fun
I hope that helps.
Have a great day.
Will
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南アフリカ 
オーストラリア 
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