Screen Mesh Rolls Fiberglass screen mesh quality fiberglass yarn with PVC coating. Different mesh size choice : 18*16, 18*18, 20*20 etc. Pet mesh screen PVC coated polyester yarn. Thicker yarn. Heavy duty and 3~7 times stronger than fiberglass Dust & pollen proof screen Synthetic fibre material. Fine yarn and tight weaving. Block tiny insects, dust and pollen staff.