... . wider pleat width.B. high filtration efficiency 99.99% 0.3um , high filtration precision.C. filter material: 80% cellulose + 20% polyester ... available, such as air filter, water filter, oil filter, carbon filter, acid filter, oil purifier, filter bag, bag filter, filter cartridge , filter equipments etc.Reason 4 Shanghai ... 100% money back guarantee in 60 days high efficiency dust filter cartridge