Style 3784 is a heavy 25.4 ounce per square yard (osy) FIBERGLASS CLOTH finished in the superior 497A silane for any resin. One layer of this cloth is strong enough by itself to make some pretty good parts. 3784 with the 497A finish is very drapable and easy to wet out to be such a heavy weight. The cloth you get may be up to 39.5" wide overall instead of 38" Email us at thayercraft@cs.com if you want larger quantities than those listed