C.R. LAURENCE CF18 CRL Charcoal Fiberglass 18" Screen Mesh - 100" Roll. CRL Fiberglass Screen Wire is a premium quality wire that is lightweight, yet tough enough to hold up in a variety of conditions. It will not rust, corrode, shrink or bend out of shape. CRL Fiberglass Screen Wire will remain attractive for years, and is excellent for use in patio door, window, and porch screens.. Part Numbers Variations: CF18