Alvin drafting triangle set includes a pair of clear acrylic plastic triangles (8" 45x90 and 10" 30x60) graduated in 16ths of an inch on two edges. Raised inking edge prevents smudging. Center cut-out finger lifts. Great triangle set for home, school, studio, or office. Alvin LX810G clear plastic drafting triangles are quality-made in Germany.