There's a solution to the constant and costly problem of replacing or re-tensioning ordinary V-belts Super II®. This rugged belt is specifically designed to provide superior performance on the most brutal drives. The kind of drives that eat ordinary wrapped belts. Super II® V-belts offer greater strength, longer life and better heat dissipation. The secret to Super II® belts is their unique construction and innovative design features that eliminate many problems common to ordinary wrapped belts. Timken Belts Super II® Classical V-Belt, B Section, 21/32 in Top Width, 51.1 in Outside Length, 7/16 in Thickness, 1 Ribs, -35 to 120 °F, Styrene Butadiene Rubber, Polyester Reinforced, Black