Alvin 12" 45/90 orange drafting triangle, drawing triangle. Constructed of molded polystyrene plastic 0.10" thick, with double-beveled inking edges and double-beveled center cut-out finger lifts. Fluorescent light has an illuminating effect on a drawing by accentuating the triangle's edge. Supplied in poly bag with hanging hole. Alvin 45-90 orange drafting triangles are made in the USA.