New Replacement Earpad for Sony Dr-bt101 Headphone Ear Pad Suitable for headsets SONY DR-BT101 diameter: 72mm Designed to enhance the fidelity of your audio by cushioning the vibrations between your ear and the headset, providing more vibrant sounds. Headphones sponge sets, in general, I recommend replace earpad every three to six months. Lot of people are not used deliberately to clean earpad, however product will contact with the secretions of face, secretions paste in headphone earmuffs, a long time it will breed a lot of bacteria, is likely to cause skin allergies, cross-infection and other diseases seriously affect health.