These are swimming pool filter , made of , which are and durable, and help prevent the hair, residue from going into the sewer. Keep your pool water crystal clear and give your swimming pool pump its best performance with the filter . Features - Color: Blue. - Size: 10.20X9.00X9.00cm/4.01X3.54X3.54in - Material: Sponge. - Made of heavy duty sponge for better filtration that can keep your pool or spa sparkling clean and after day! - These above ground pool replacement filter is more washable and reusable than other pool filter, and will reduce your costs. - Compatible with swimming pool, fish tank, bathroom, and so on. - The filter sponge has good flexibility, high resilience, can be bent repeatedly without deformation and damage, durable. - For maximum efficiency, clean each week and replace at least once a month. Package list: 2 x filter elements