About this item Bulk Headphones 30 Pack: 8 different colors mixed, each individually opp packaged, abundant to use as class sets of headphones for students to meet demand, they are rich in colors, providing you with multiple choices. Comfortable to Wear: Ear earbud of student headphones are made of soft silica gel pads for a comfortable fit; and don't have a built-in microphone; providing clear sound that does not feel jarring and is suitable for your everyday use. Universally Compatible: The classroom earphones are compatible with 3.5mm jack, plug-and-play, perfect for classroom devices: cell phones, computers, laptops, Chromebooks, audiobooks, and tablets. Practical and Reliable: The cable uses TPE material for softness and durability, enough length for you to use while listening, testing, or sleeping, sturdy, serviceable, and not easy to break. Size: 7.72 x 5.83 x 2.09 inches.