Material: the pool socks are made of nylon cloth with good quality, and the package include 20 pack, enough for your application for a long lasting time Size: 21.5 x 12 cm/ 8.46 x 4.7 inches (LW), and the socks have good elasticity to stretch easily and enough to cover the skimmer basket, fit for swimming pools Function: the filter socks just like a net to filter the rubbish such as leaves, grass, hair, scum and so on, help keep your pool clean and save cost Warm notice: most often, the socks can be applied for 4 to 8 weeks with its good effect, please clean them up to apply again or throw them when they soiled color: White Material: Nylon Package Contents: 20 X 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.