Compatible with: 50X, 40X, MSR7, SX1, SX1A, PRO5, PRO5V, M10, M20, M30, M35, M40FS, M45, M50, M50S, M50cwh; for MDR7506, MDRV6, MDRCD900ST, for PRO900, HiFi 780 headphones. Full list please check below. Not compatible with MDR 1A, MDR V600, MDR X10 and MDRXB950BT. It may work with other headphones if the ear pad dimensions fit. Ultimate Comfort & Long Use Soft, breathable, and durable materials wrap the ear area for comfortable wear. Internal ultrasoft memory foam padding plus a flexible frame deliver maximum ear comfort for long listening sessions. You can wear them for extended periods without fatigue. Enhanced Sound & Noise Isolation density memory foam cushions help isolate external noise and reduce distractions. The padding also supports improved mid and bass response, delivering clearer, more focused listening. Enjoy your music with less intrusion from the surrounding environment. This is passive noise isolation, designed to enhance your listening experience on compatible headphones. Use scenarios Studio monitoring and mixing: compatible with common monitoring headphones, enabling extended sessions with reduced discomfort and better mid/bass clarity. Daily commuting or travel: lightweight, comfortable fit makes long trips more enjoyable while listening to music or podcasts. Home entertainment and gaming: improved isolation helps you stay immersed in movies, games, or music without external interruptions.