Maywa Denki is an artistic and musical act first made popular in Japan. The KnockMan figures are part of the original act. Move his left arm up and down to wind up the spring and he will start knocking his head. Turn his right arm and he will knock other KnockMan's head. Each character plays only one instrument, which you can see played because of the simple design. They're 10 cm tall and don't need batteries to work their magic.
— "KnockMan from Maywa Denki — the ones with band member figures....by a Japanese musician," said Luke Rook, owner of Lulubell Toy in Tucson, Ariz., when asked by TDmonthly about best-selling musical toys in his store.