This little product seems simple enough but it can save the engine builder a lot of time and trouble. Simply locate and stamp the 9.5" O.D. flywheel for top dead center using the stop block method. Once the builder has TDC located one can apply the high quality decal to the flywheel and have 50 degree's of highly accurate, large, readable, and bright timing marks ready for use! (2) Two decals per package. All new VM flywheels come with timing tape included in the price.