Box contents: you will receive a set of 20 swimming pool filter bags.You can simply throw them away or reuse them after 4-8 weeks (if they are not very strong) and replace them with new ones. 【Material】The pool skimmer socks are made of good quality nylon fabric, and they have good elasticity to stretch easily and enough to cover the skimmer basket, suitable for use in swimming pools. 【A good helper for swimming pool cleaning】Pool filter socks can help you maintain the swimming pool.These pool skimmer socks catch oil, hair, beetles, grass, pollen, leaves, pine needles and other small debris that can block your pool filtration system. 【Filter System Protection】Our skimmer basket filters can extend the life of the swimming pool filtration system and protect the pump impeller and shaft seal from damage and clogging. 【Widely Used】Swimming pool skimmer socks are suitable for almost all types of swimming pool filters, baskets or skimmers.