This product is indoor pool filter sponge, made of sponge material, with simple design and practical function. It has simple installation method and is easy to use, which can bring convenience to your replacement work. This is very good filter accessory that will bring you good experience. Features - Color: Blue. - Material: Sponge. - Size: 10.80X10.80X7.00cm/4.24X4.24X2.75inch. - Our swimming pool filter sponge features with good flexibility and adaptability, simple and practical. - Can be applied for swimming pool, sink and aquariums, useful for your long-term demands. - This indoor pool filtering sponge with high-density effectively cleans much rubbish in swimming pool. - Our pool filter sponge replacements tool can be compatible with indoor pool, outdoor swimming pools. - This breathable filter sponge tool is easy to use, reliable and useful, save you time and effort. Package list: 1 x filter sponge