Adjustable Plastic Ear Band Extension, Anti-Slip Grip Buckle For Mouth Cover, Relief Ear Pain, Clear Size: about 16mm wide, 146mm long, 4.88mm thick. 1.Three adjustable levels, suit for most of the people, with different work, including children. Please put the ear hook on the two sides of your Face Protection, and adjust the 3 levels according to your need. 2.Relieve the pressure of your ear from long-term wearing of the Mouth Cover. 3.With anti-slip groove design, not easy to fall down or move, super easy and convenient to wear. 4.Comfortable for whole day.