Fine Fiber rolls are made from the purest and highest quality polypropylene. Outer layers are made from small diameter densely woven polypropylene fibers. These layers are then ultrasonically bonded to a high loft meltblown core.Part #: UQER150P Weight: Medium Size: 30" x 150' 1/balePart #: UQESR150P (split-rolls) Weight: Medium Size: 15" x 150' 2/bale