Pleatco PSD125-2000 Replacement Cartridge for Sundance Double End 120, 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 19-by-2-3/16-by-2-3/4-inches beveled edge with Slip Made in the USA