Syntec 7" Tear Drop Cup Wheel - 60/80 Grit with Threaded ArborSyntec 7" Tear Drop Cup Wheels are a design that has been growing in popularity over the past few years. The tear drop style is a very aggressive cup wheel designed for concrete removal and floor preperation. Syntec has been hard at work over the past few decades manufacturing diamond cup wheels among the industry's best, providing superior grinding performance.