Designed with busy classrooms in mind, and ideal for use in schools, libraries and computer labs, this HamiltonBuhl Lab Pack includes 10 blue Flex-Phones™- nearly indestructible headphones for kids ages 3 and up. Each Flex-Phones™ headphone comes in its own heavy-duty, anti-lice, write-on, moisture-resistant, resealable bag. These indestructible Flex-Phones™ are made from a single piece of EVA foam - a safe, non-toxic, BPA-free, soft and an extremely flexible material. Certified for all major USA and international child safety testing standards, Flex-Phones™ deliver high quality sound that will never exceed 85 decibels, ensuring young developing ears are protected.