These patented harmonic balancer covers offer improved readability, more stable Top Dead Center indication and timing accuracy and enhanced appearance for a previously ignored underhood area. They are available in an array of colors and syles - resulting in parts with the appearance of $200 balancers. Each cover is distinctively marked with Top Dead Center and the proper timing degrees. Mounted directly through the center hub, these aluminum covers eliminate the affects of any outer inertia ring slippage.