These filter balls are made of good material, which have better elasticity than traditional filter materials. In the filtration process, the efficiency is high, the filtration is fast, the sewage interception capacity is large, and they are renewable, and they are suitable for filtration of various quality. Features -Color:White -Material:Sponge -Size:7.00X7.00X7.00cm/2.75X2.75X2.75in -Helps lines from body oils, lotions and make-up in your pool or spa. -Prolongs pool/spa filter life by eliminating before it forms. Enough for your daily needs, especially if you need to clean large areas. -Suitable for swimming pools, hot tubs, jetted tubs and spas, etc. Suitable for all kinds of pools, parks, children's pools. -Adopts precision production to stable characteristics and high reliability. -Filters for floating swimming pools to effectively filter,which is convenient. Package list: 4 x Filter Balls