These are custom made covers for individual LEDs you want to black out. They snap over your led for a nice snug fit. For extra support, you can use small wire to tie through the small holes around the existing cable. The inside is black to block out the light. The outside is white for a clean look. It's printed with PETG filament to better withstand hot and cold temperatures. Govee sells Regular and Pro style lights. These are compatible with any of the Regular sized ones: Govee Permanent lights H705A Govee Permanent Lights 2 H705E Govee Permanent Elite Lights H805A Sold in pack of 4.