Style 1800 fiberglass cloth is a 9.8 oz/sq yd plain weave boat and tooling type fabric with a thread count of 16 x 14 ends/inch. Style 1800 uses the yarn ECK 18 1/0 in the warp and fill. The "K" glass filament is 13 microns and is much bigger than the 9 micron "G" filament used in style 7500 fiberglass cloth that has the same weight and thread count. The thicker 13 micron filament flatter yarn in 1800 makes it quite a bit stiffer than the similar style 7500. We just have a few rolls of style 1800 with the clear 627 finish for epoxy or polyester resins. Your price is just $4/yd for 50" for any of the individual factory rolls listed