Compatibility: Compatible with Boat Rockerz 400, 430, 370, 900, Sony WH CH500/ Sony WH CH510/ Sony WH CH520 Headphones ONLY. Please confirm your headset model before purchase. Rugged Durability: Made with high-density noise Isolation foam and softer high-grade protein leather, our Added Stitching earpads will seal around your ears brilliantly, which finds the perfect balance of comfort and noise isolation. Enhanced Sound: Your old earpads negatively affect the sound quality of your headphones, while our precisely modeled earpads will not affect the sound performance of your headphones and make your headphones look brand-new again. Easy to Install: No special tools are needed with a easy installation. Firstly remove the broken earpads, then put new earpads inside the headphone ear cups, snap the earpads easily into place. This ear pads is not only easy to install, but also forms an important acoustic seal, which brings you more quietness. Perfect Replacement: Our Professional Earpad cushions are a perfect replacement for lost worn-out ear pads, the same quality as the original at a super reasonable price.