Pleatco PJ100-4 Replacement Cartridge for Jacuzzi CFR/CFT 100, 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 19-7/8-by-5-15/16-by-6-inches Made in the USA