filter out leaves, grass, hair, pine needles, pollen, and other debris that might block your pool filter system. [Protect Pool Filter System]Skimmer Filter socks help prevent damage to your pool filter and extend the life of your pool filter system. [Universal Range] stretch diameter 2.75 to 8.66 inches, 13-22 cm, pool skimmer basket socks fit any size and shape of skimmer basket. Suitable for swimming pools, hot tubs, spas and jet tubs. [ and Reusable]The pool skimmer basket socks are made of elastic and ultra-fine nylon for extra durability and can be rinsed and reused as needed. The 40-count pack is affordable and easy to use. It is recommended to replace your pool socks every 4 to 8 weeks. color:white Material:polyester Package Contents: 1 set of pool skimming socks (40-pack) Only the above package content, other products are not included. Note: Light reflection 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.