1. High Quality 2 .Best Service 3. Fast Delivery Character of Product1.All bag filters are melting without seam to make sure it can be used well.2.All bags have orientation and the effective filtering area is 100%.3.High efficiency, low resistance and large dust capacity.4.Without fiber, so it has no risk of breaking.5.Metal folding frame, used circularly, easy to change ,washable and can be used ...