Flex-Phones are nearly indestructible, made from a single piece of EVA foam. EVA foam is sage, non-toxic, BPA-free, soft, and an extremely flexible material. Recommended for children 3 years and up, Flex-Phones are packaged with a snap-on extension band for smaller children - just snap on the extension band for a snugger fit. The extremely clear sound quality will never exceed 85 dB, ensuring young developing ears are protected. Blue.