[Save Time & Money] -- Replacing your filter cartridge with paper is part of routine pool maintenance and regular replacement can be expensive. These washable foam filters and reusable will reduce your costs. [Reusable Washable] -- This foam filter can be washed and reused many times. You should see a foam filter last around 2 months. [High Quality] -- Made of quality sponge. This foam filter with softness, repeated bending, good flexibility, high rebound. [Excellent Function] - The sponge filter can help clean particles and debris, and extend the life of your filter media, provide efficient water flow with less clogging for filtration and cleaning durable. Color: blue Material: sponge Size: 10.2 x 9 cm, inner diameter 3 cm Package contents: 4 * filter sponge Only the above package, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The allowable measurement error is +/- 1-3 cm.