Nice kit understand the mechanical structures, and transmission.<br> Non toxic, smooth without any burrs, and durable lasting use.<br> Direct assembly, for other accessories, simple assembly, exercises the child's ability.<br> Great , simple and practical parent child communication or intellectual development, stimulate children's learning fun.<br> Can exercise the children's practical ability and other abilities. Cultivate children's curiosity and to explore science, very interesting.<br> Specification:<br> Material: Wooden<br> Size Chart:<br> 7cmx14cmx8cm/2.76inchx5.51inchx3.15inch<br> Package Includes:<br> 1 Set DIY Kit Science Experiment<br> Note:<br> 1.This is not infant toy, please from children to avoid eating.<br> 2.Please slightly errors due to manual measurement and different monitors.<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin