wooden cube box contains 27 cubes of different shapes and colors. The colors are red, yellow and blueThe surface of the building blocks is smooth, no burrs do not hurt hands, and protect the baby's safety Strengthen children's ability of classification exercise.Enhance children's hands-on ability.Promote children's cognition and understanding of three-dimensional space. Cultivate children's mathematical classification and reasoning ability.Cultivate children's basic way of logical thinking.Improve children's ability to solve problems.