The Synchro-Cog timing belt has a trapezoidal tooth profile for traditional synchronous applications. Synchro-Cog belts feature an advanced polymer construction with molded teeth that are sheer resistant and designed to assure smooth, positive meshing with the sprocket. A tough nylon tooth facing is wear resistant. High quality fiberglass cords are specially treated to provide strength, flex life and resistance to stretching. Synchro-Cog timing belts are an excellent choice for clean, quiet and maintenance-free performance.