30 Sets of Black Headphones,each bulk headphone individually sealed Designed with Adjustable headband, comfort and lightness,ideal for classroom use and school testing Extra Soft Ear Cushions; Ear Cushions Can Be Wiped Clean,Provide you with stereo audio clarity and nice sound quality Stereo 3.5 MM Plug and 4ft Cord Works with Smartphones, Chromebooks, Tablets, Laptops, Computers, Fitness and Audio Equipment These headphones can be widely applied for classrooms, school, libraries, museums, hotels, gyms and more places OSSZIT Service: If you have any questions,please contact us,we will solve for you within 12 hours give you the most satisfying reply