Pleatco PA137-4 Replacement Cartridge for Hayward Super-Star-Clear C-5500 SwimClear C-5520, 1 Cartridge Replacement filter for pool and spa cleaning systems 50% open ABS free flow cores maximize water flow through REEMAY filter media Antimicrobial end caps resist chlorine degradation and provide support to filter material for a longer life span 32-3/4-by-3-by-3-inches Made in the USA