Westcott French Curve 3 Pieces Set is made with clear transparent heavy duty plastic, which gives you a wide range and variety for your drawings. This French Curve set includes curve rulers of three popular sizes (5 1/2", 6 1/2" and 12 1/2"). Smooth double-beveled inking edges makes this drawing ruler ideal for detail work. Westcott Drafting and Drawing Tools are some of the finest products of their kind for students and professionals. Our commitment to meticulous quality and cutting edge innovation in measurement and art materials has earned an unparalleled reputation.