Smooth surfaces and rounded corners allow you to play with your friends and kids with confidence For kids, the brain teaser cubes will get their eyes away from the electronic screens and help them sit quietly. As you see, you can create various shapes in your imagination with the 3D puzzle cubes and carry them anywhere in your pocket, suitable for children over 3 years old Made of GPPS plastic, non-toxic, tasteless, eco friendly, harmless to human and environment. Great toys to develop children's creative ability and handling ability.