Metal Crown Molding : Crafted from rust-resistant aluminum alloy with excellent heat dissipation. High-transmittance PC cover optimizes light diffusion for a soft glow while protecting LED strips from dust buildup LED Ceiling Trim & Protection : Replaces bland plaster moldings by transforming harsh edges into a soft luminous halo, adding modern elegance while concealing ceiling-wall joints. Its protective design safeguards corners from damage Surface Mount : Secure with included screws, insert LED strips, and snap on the cover. It can also be used on walls or skirting boards. You can also use seam sealant/repair paste (not included) to make joints even less visible Light Strip Not Included : Our LED diffuser channel are suitable for light strip with width less than or equal to 8mm (5/16"). If you need corner connectors / custom size please contact us. Oversized lengths will be pre-cut before shipping Widely Used Indirect lighting molding strips are perfectly adapted to most scenarios and are ideal for creating an illuminated atmosphere. Can be used in living rooms, kitchens, terraces, bedrooms, basements, theaters, corridors, hotels, shopping malls, closets, staircases, cabinets, hallways, and even floor skirting, decorating wherever you like to show your elegant taste