Alvin 30/60 professional drafting triangle. Quality 12" drawing triangle is 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 professional 30/60/90 fluorescent orange drafting triangles are made in the USA.