Precision Wound Depth Filter Cartridges Provide Cost Effective Filtration of Fluids @ Absorbent Cotton, Standard Cotton, Natural Cotton, Polypropylene and Glass Fiber Filter Media Available @ Available in Retention Ratings from 0.5-200 Microns @ Cartridge Lengths from 9 3/4" to 40" Permit Rapid Installation into Sayes and Most Competitive Filter Housings; Other special lengths available according to your requirement. @ Core Cover, Extended Core Options Available Product Specifications   Filter Medium: Absorbent Cotton, Standard Cotton, Natural Cotton, Polypropylene and Glass Fiber and premium polypropylene meet FDA requirements for application in food grade fluids. Retention Ratings: 0.5, 1, 3, 5, 10, 20, 25, 30, 40, 50, 75, 100, 200mircon Dimensions (nominal): Lengths: 250mm, 10" (254 mm), 500mm, 20" (508mm), 750mm, 30" (762 mm), 1000mm, 40" (1020mm), 50" (1270 mm), other special available. Center Core Materials: Polypropylene, 304 Stainless Steel