FABRIC
The fabric shall be made from first-quality staple cotton, uniformly woven and of a grade known as "firsts." The weave shall be two up and two down in the warp and one up and one down in the weft.
The gray cloth shall consist of from 33 to 36 threads per centimeter (85 to 90 per inch) in the warp, and 12 to 15 threads per centimeter (30 to 38 per inch) in the weft.
The surface shall be finished smooth and hard and show no tendency to stick when folded upon itself.