Flex-Phones™ are nearly indestructible, made from a single piece of EVA foam. EVA foam is safe, non-toxic, BPA-free, soft and an extremely flexible material. Flex-Phones™ are certified for all major USA and international child safety testing standards. Comes with the exclusive Dura-Cord™ the chew, kink and knot-resistant, PVC-jacketed, braided cord, as well as a headband clip to help adjust and configure the fit. Most importantly, the extremely clear sound quality will never exceed 85 decibels, ensuring young developing ears are protected.