You can easily make rice balls of the same size as long as you shake it with rice.Use it for balls for school lunch everyday and this is a much more efficient No rice sticking to your fingers, and it's easy to clean. It was definitely worth the money Material: food grade pp,easily for washing Mold Size: 4.84*6.30*2.17in (12.3*16*5.5cm) How to use: 1. Put rice into the container 2. Close the cover and locked. Then shake approx 20 times 3. Unlock the cover and remove the onigiri