Poolmaster 12256 Replacement Filter Cartridge for Micro Star Clear C-200 CX200-RE Filter Equivalent to the following replacement filter cartridges; Pleatco PA20 and Unicel C-4320 The top of the replacement filter cartridge is open 2-1/16 and the bottom is open 2-1/16 Break-resistant bands keep pleats separated for greater flow, filtration and add longer life to cartridge High quality spun bonded polyester material for exceptional water filtration Premium grade polyurethane and plastisol end caps