Fit for: all lifestyle cinemate(excluding the Lifestyle 650 system). Replace for Bose UB-20, compatible with Lifestyle 6 10 15 18 28 12 30. Compatible with select Bose Lifestyle, Acoustimass, CineMate, and SoundTouch systems including ST535 ST525 ST520 535III 525III CM520 SoundTouch JC-II AM6-V AM10-V AM10IV Virtually Invisible 300 Lifestyle 600(Not for Lifestyle 650 system). All hooks are made of rounded corners, easy to install. Crude scrub and glaze light surface,touch smooth. Glaze light multilayer reinforcing brackets,waterproof and dustproof. Email us for PDF install instruction if you don't know how to install.