Descr YARN COUNT WEIGHT   WARP WEFT WARP WEFT (gsm) COTTON SHEETING 30 30 68 68 115 gsm. COTTON SHEETING 20 20 60 60 155 gsm. COTTON DUCK CANVAS 16 8 84 28 230 gsm. COTTON DUCK CANVAS 10 6 76 28 320 gsm. COTTON DUCK CANVAS 3/10 3/10 44 26 525 gsm.