Alvin FT450-4 orange drafting triangle. Quality 4" drawing triangle is constructed of molded polystyrene plastic 0.10" thick, with double-beveled inking edges and double-beveled center cut-out finger lifts. Popular drafting triangle's fluorescent light has an illuminating effect on the drawing by accentuating the triangle edge. Supplied in poly bag with hanging hole. Alvin 45x90 fluorescent orange drafting triangles are made in the USA.