Pleatco PA40 Replacement Cartridge for Hayward C-410, Easy Clear C400, 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 14-1/16-by-3-by-3-inches Made in the USA