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the product is smooth without burrs and does not hurt hands. it is polished by multiple processes, with a smooth and round surface. it takes care of baby's hands and plays without injury it is hard and firm, resistant to falling and playing, and exercises children's brain ability and logical thinking ability exercise children's brain movement ability and logical thinking ability compared with traditional toys, high simulation three-dimensional assembly is more challenging and can stimulate your logical thinking and spatial imagination parents can cooperate with their children to assemble together to enhance the interactive relationship between parents and children;.syi