Pleatco PJ120-4 Replacement Cartridge for Sherlock 120, Jacuzzi Brothers, 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 20-1/2-by-6-inches with handle Made in the USA