Nice Compatible: Compatible with PreSonus HD9 HD-9 HD 9 Headphones. ( Please note: Not compatible with PreSonus other series Headset ) Easy Installation: Smooth installation with this complete replacement ear pads. No special tools are needed. If you have any questions, you can feel free contact us Unmatched Comfort : Professional-grade hybrid velour is designed for long-term, crack-free. These high quality replacement pads are specifically designed for long-term comfort so you can enjoy long gaming sessions with your headphones pain free Noise Reduction: It can reduce the noise coming from outside, and to enhance the fidelity of your audio by cushioning the vibrations between your ear and the headset, providing more vibrant sounds You will received: 1 Pair ( 2 Pcs ) of Upgrade Black Hybrid Velour Ear Pads 0