1. wound string filter cartridge media : PP( Polypropylene), cotton; 2. length: 5'', 10'', 20'', 30'', ... filter length : 10'',20'', 30'',40'';2. wound string filter cartridge media: pp, cotton ;3. micron : 1um, 5um, 10um, 20um, 30um ... , 50um,,,,4. core material : polyropylene or stainless steel ;5. inter diameter :28mm, 30mm;6. outside diameter : 55cm, 61cm ...