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-Phonesare certified for all major USA and international child safety testing s tandards. We are extremely proud that they have been awarded the Scholastic Teacher's Pick as "The Best of 2015". Recommended for children ages 3 and up, Flex-Phones are packaged with a snap-on extension band for smaller children just snap on the extens ion band for a snugger fit. Most importantly, the extremely clear sound quality will never exceed 85 decibels, ensuring young developing ears are protected.