Pleatco PPM35TC Replacement Cartridge for Pacific Marquis 34 (Old Style), 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 11-7/8-by-1-5/8-inches with closed top Made in the USA