Science & Exploration Sets features: This wooden stacking game toy is made of the premium wooden material that is safe and durable for long time use. It is eye-catching and educational, which can be fitted to your kids learning and playing. It is very colorful, offering your child hours of entertainment and training his or her hand-eye coordination. Features-Color: Colorful-Material: Wood-Size: 8.00X2.00X2.00cm/3.14X0.79X0.79in Made of solid wood, it is smooth without hurting your babys hands Build early shape, color and size differentiation skills, it can improve children's imagination as well as promote their physical and intellectual development Put the building blocks in the right place in order to improve the baby's hands-on ability The texture is very dense, hard, load-bearing, not easy to crack, and very delicate in the hand The toy has smooth edges, keeps away from burrs to care for every inch of baby's skin.