[Application]- Our skimmer basket filters can catch the finer plant / tree leaves, pollen, beetles and other tiny things. You do not have to change the filter as often to save costs. [Size]- 22 x 13 cm / 8.66 x 5.11 inch (LW), and the package contain 40 pack, enough for your use for a long time, Easy to clean and reusable. [Material]- are made of nylon cloth and they have good elasticity to stretch easily and enough to cover the skimmer basket, fit for use in swimming pools. [Easy to Install]- Install in seconds, just slide the sock over the basket and it's ready for collecting dirt from the water. []- Pool Filter Saver Socks Net Good protection for your garden pool filter system.