This exclusive grid pattern canvas is specially designed for pottery usage. It is made of heavy duty cotton canvas printed with an inch-spaced grid for easy measuring. Stretch and tack canvas to a plywood board or to a dedicated work table top for the ideal clay working surface. Cut clay slabs to measure accurately - at right angles following the grid or to 45º along the diagonals. The cut edges will not be seamed. The one-inch grid pattern is about 5% larger than actual size as there will be some shrinkage after the canvas is soaked in water. Never machine wash or dry.