YUNDA FILTER is a professional manufacturer of all kinds of water filters and elements, such as water filter housings, cartridges, connectors, UV light, FRP, faucet,etc. YUNDA FILTER has over 10 years export experience. Direct price and good service. PP Wovenfilter uses 100% PP as material, can be with PP core or stainless steel core. Cotton material can be made. The waterfilter cartridge contains no wetting agents,solvents,antistatic agents or binders. Each micron rate has its string pattern to ensure the filtration effect. Details as following:Material:1.PP strings with PP core 2.PP strings with SS core 3.Absorbent Cotton strings with SS coreOD(Outer Dia.)=50 114mmID(Inner Dia.)=28,30mmL(Length)=5,10,20,30,40 inchesMicron Rate=0.5,1,5,10,25,50,75,100um