HamiltonBuhl LCP-10KBL Lab Pack 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. Twist-em turn-em stretch-em kids wont break em!