Traditional V-Belts are manufactured with cross-sections Z, A, B, C & D sections with a range of over 800 lengths currently available. V-Belts for industrial use are designated both to RMA standard e.g. A52, where the letter designates its cross-section and the number corresponds to a nominal internal length in inches and to DIN standard e.g. 13x1320Li, where the first number denotes the width in mm, and the second number is the internal length in mm.