Durapower®II's strength and lasting power can be attributed to Timken engineers and their ability to successfully combine the advantages of Raw Edge technology with the unique CNA belt building process. Centralized Neutral Axis (CNA) refers to the placement of cords in the middle of the belt's cross section. This lower-than-normal cord placement gives the belt greater flexibility and keeps it stable in the pulleys on high shock load applications. To further assure top performance, Durapower II utilizes fiber-loaded rubber called stiff-flex- a compound previously found only in higher priced premium belts. By combining Raw Edge belt sidewalls, CNA cord placement and construction using specially formulated rubber, Timken offers Durapower®II - an economically proven v-belt with value added benefits unequaled at any price in light duty v-belts. Timken Belts Durapower®II V-Belt, FHP Light Duty, 4L Section, 1/2 in Top Width, 9/32 in Thickness, Fabric Cover/Rubber Body/Polyester Cord