Flex-Phones Foam Headphones are made from a single piece of EVA foam. EVA is a safe, non-toxic, BPA-free, soft, flexible, nearly indestructible product. Flex-Phones are certified for all major USA and international child safety testing standards and are recommended for children ages 3 and up. Most importantly, the extremely clear sound quality will never exceed 85 decibels, ensuring young developing ears are protected. These headphones are also packaged with a snap-on extension band for smaller children. Just snap on the extension band for a snugger fit.