The Strainrite Companies offer quality wound cartridges which allow us to be your one stop buying solution to all your filtration needs. Our wound cartridges are available in a complete line of filter media, such as natural and bleached cotton, rayon, polypropylene and fibrillated polypropylene, etc., and core material, such as polypropylene, tinned steel, 304 stainless steel, 316 stainless steel, and phenolic. Our standard sizes are 10?, 20?, 30?, 40? and variations of the standard lengths and outer diameters to meet your needs. We offer 12 different micron ratings, thus allowing the best possible combination for your particular application.