HamiltonBuhl 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. We are extremely proud that they have been awarded the Scholastic Teacher's Pick as a "Best Of...". Recommended for children ages 3 and up, Flex-Phones™ deliver excellent, clear sound quality that will never exceed 85 decibels, ensuring young developing ears are protected. Flex-Phones include a snap-on extension band for smaller children – just snap on the extension band for a more snug fit.