Safe Material and DurableThe stretchy tear-resistant squeeze ball is made of non-toxic TPR material(Before using, it is recommended to undergo a skin test), providing softer satisfying touching and more durability. You can use these squishy toys for squeezing exercises repeatedly and create fun shapes with these malleable cube squishies, which are safe, durable, elastic, has high tear resistance, is not easy to damage, providing endless hours of relaxation and entertainment.