Breathable material Weather-proof, UV protected, waterproof Suitable 9-10ft boom Sail Easy and quick to use sewn in magic fastening straps to hold cover secure [NOTE]Please avoid the UV LIGHT direct exposure to the fish. If you are using a fish tank, you can use it in the aquarium filter or use the opaque boards can effectively isolate. If you are using a pond , you can place this aquarium UV light in the pond filter or pond filter screen. It is recommended to use the light for 1-2 hours per day. Colour:Blue Material:Oxford cloth Package Contents: 1x Waterproof Sail Cover Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.