Japanese Drum (45 cm) I bought this to use for a performance at a friend's wedding! I'm a complete beginner, so I don't know much about it, but I bought it new and used it for about a month and a half. Even though I'm a beginner, it made a powerful sound. The diameter of the drum (the striking surface) is about 45 cm. I made a stand for the drum myself, and I'd be happy to give that to you as well if you'd like.