Made with a single piece of foam for comfort and durability, the Scholastic Award winning HamiltonBuhl Flex-Phones are perfect for your little ones. The Flex-Phones have a safe maximum volume so your child’s hearing will be protected. The EVA foam is non-toxic and BPA-free. Headphone Features Audio Drivers: 30mm Cable Type: Round Cable length: 1.21m (4’) Frequency Response: 20 - 20000 Hz Foldable/Adjustable Headband: Yes Indestructible EVA foam is non-toxic and BPA-free Certified Child Safe Packaged with snap-on extension band for snugger fit