The second edition of Spring Pyonkoma by Dr. Koma, Shiro Yamazaki, is a magical spinning spinning piece that is bouncing and spinning even though it is a spinning spinning spinning piece. Rotate and drop it from a slightly higher position and it will start spinning smoothly when you finish the bounce. This fun piece was collaborated with Shiro Yamazaki, Gokou Gotsu, Co., Ltd. that manufactures and develops springs. The 5 light roots are made by spring company, where the links are made by a spring company, creating links using a single spring to shave wood or iron. Japanese technology and an abundance of the idea of production Enjoy the fun of children and enjoy the high level of Japanese technology. >> Product listing for simple (koma) Specifications: Size: φ1.7 x H 1.2 inches (4.2 x 3 cm); Weight: 0.4 oz (10.2 g); Material: SUS304WPB (stainless steel wire) *Rubber handle colors are assorted. Please note that the color may vary from the pictures.