... .long using life 2.venting quality 3.high efficiency of dust collection 4.great varieties 1.wide varieties:polyester,anti-static ... one side,calendering,heat-settingPolyester, oil and water, dirt repellent finish500PE/PE1.8≤130oil and water, dirt repellent finish; cleanability supporting finish ... ,calendering,or teflon coating4.some picture for your information ISO9001 dust bag for dust collector