Special curvable board is a composite of high-density PVC foam bonded between smooth-surfaced PVC sheets. Simply warm with a heat gun and curve to shape. Holds its new shape when cool. Great for making contoured surfaces. Cuts with a knife. Edges can be sanded smooth. Each panel is approx. 12 inches x 18 inches x 3mm (1/8 inch) thick. White outer surfaces and core.