Fiberglass, .75 Oz (CSM) Mat, Pre-cut & Packaged, 50" Wide, 10 Yd Long Premium Fiberglass Mat is the most basic and commonly used reinforcement in composites Used as a skin coat to bond Gelcoats Used between rovings and cloths as a binder and to bond substrates and cores in a laminate Generally Mats are made with chopped roving strands and bonded with a resin-based binder 3/4 Oz Mat is approximately 1/32" thick laminated