Dimensions: The length of the swimming pool filter is 2.87 inches / 7.3 cm, inner diameter: 1.57 inches/4 cm, outer diameter: 4.25 inches / 10.8 cm.Material: Made of high quality Sponge, soft and flexible, reusable and durable, can be used for a long time.Cut Costs: Replacing your paper filter cartridge is part of your routine maintenance for your pool and regular replacement of the cartridge can prove costly, these washable and reusable foam filters will reduce your costs.Reusable and Washable: The Foam filter has a good flexibility and high rebo, it will outlast your paper cartridges and can be washed and re-used several times over.Wide Application: The Filter Cartridge Sponge is suitable for S1 Type, suitable for Swimming Pool, Spas, Fish Tank, and more.Type: Filter SpongeColour: BlackMaterial: SpongePackage Contents:2 x Swimming Pool FilterOnly the above package content, other products are not included.Note: Light 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."