I guess you would consider it some type of tracing paper-I get it from head gskt sets for Cat engines that I work on. Any type of tracing paper would work. I tape it to the part that I am covering and then trace an outline 1-1 1/2" larger than the actual piece. This is enough for you to grab and pull when ironing in place. Lay it out on MonoKote and cut out. I will label it left and right, or upper and lower for the pattern. I save all of these for the "God forbid" repairs.