C-Thru GRAPH Ruler 2" x 18" is the perfect tool for drafting any size patchwork or applique pattern. It is also a valuable measuring aid for all home sewing projects. It is made of clear see through flexible plastic, with laminated permanent printing. It is graph ruled--inch is marked in 16th, and it has a zero centering scale with holes pierced every 1/2 inch. Plastic.