Pleatco PCD50N Replacement Cartridge for Caldera 50 (new 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 10-3/4-by-2-11/16-inches with swivel handle Made in the USA