SCIENCE Kits for 8-12 wooden 3D puzzles and Adults thatcan be tools . machine is designed to teach children hands on skills like coordination, physics, STEM principles and more OF ALL AGES from kids 8 and up to we also make 3D wooden puzzles for adults who love a challenge and the sense of accomplishment. PERFECT PHYSICS TOYS GIFT to or family to craft learn and have Beautiful design, more than a toy, puzzle machine is great for a birthday or any occasion. ROLLING into a world of and your own run with battery kit. Types: Hand crank Power supply:2 AA batteries (not included) Colour:Wood color Material:Wooden Package Contents: 1 set x Physics Toy Science kits 1 x Chinese and English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.