TB Wood’s Narrow (Ultra-V) sheaves include three cross sections: 3v, 5v and 8v and are constructed of fine grain, high tensile cast iron and have been carefully engineered to assure maximum performance over a long life span. For applications with special requirements, Wood’s sheaves are also available on a made-to-order basis in either cast or ductile iron, in Sure-Grip® or bored-to-suit construction.