Compatibility: Compatible with Sennheiser HD 4.50BT, HD 4.50BTNC, HD 4.50SE, HD 4.40BT, HD 4.30G, HD 458BT, HD 450BT, HD 400S, HD 350BT, HD 4.20S Headphones. Please confirm your headset model before purchase. Enhance the Sound: Adopting the high-grade protein leather and the high-density foam, our earpads will seal around your ears brilliantly, ensuring you excellent noise isolation and extreme comfort. Comfortable Material : We Earpads use more comfortable sponge and protein leather to ensure that the Headphones Cushions are more ergonomic and comfortable to use all day without any problem. Quick installation: We provide an installation video, you can quickly make your headset look like new without any auxiliary tools. Package Include: You will receive 1 pair of earpads. NOTE: Your old ear pads will have a negative impact on the sound quality of the headset. Why not buy our new Street27 ear pads to make them look brand new again.