These professional grade acrylic triangles will not discolor or warp with age and handling. The machined finish and hand polished edges meet or exceed government specifications. The fluorescent color of these triangles is popular because the refracted light has an illuminating effect on the drawing by accentuating the triangle’s edge. All models feature a double-taper cutout center for quick, easy lifting from any angle. The triangles are available in 30/60 and 45/90.