Fajiabao Interesting Multivariate Magic Ball Crawling Ball Creative Assembly Building Blocks Puzzle Toy for Kids Ball size about:4.84''x4.84''.Healthy plastic materials,new safe non-toxic. It's easy for kids to hold the ball because the weight is light. It is safe and has no sharp edges or points. Easily washable and waterproof, and also can keep it as bath toy. Encourages crawling,improves kids' sport ability and the sense of touch;easy for baby to grab and play with. Many different models can be assembled, it can improve kids' cognitive and operational ability.