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 "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 extension band for a snugger fit. Most importantly, the extremely clear sound quality will never exceed 85 decibels, ensuring young developing ears are protected.