Adoption of premium birch material, the screws and nuts are safe for kids to play. Fun and interesting . It is great for developing kid's hand-eye coordination, logical thinking and shape cognition. Features -Color:Khaki -Material: Birch -Size: About 5.00X4.20X4.20cm/1.97X1.65X1.65in - Guide the baby to assemble a variety of shapes, very creative and funny. - Exercise children's hands-on ability and logical thinking ability, very interesting. - Made of premium wooden material, which is for the lasting playing. Its water paint is safe for kids. - Comes with colorful design, it will bring more fun to your kid. These screw toys are an exceptional kids. - Parents and children can play multiple games to help strengthen hand-eye coordination and more. Package list: 1 x Set of Cross Nut and Screw Toy 1 x Set of Triangle Nut and Screw Toy 1 x Set of Hexagon Nut and Screw Toy 1 x Set of Square Nut and Screw Toy