Lapidary Diamond Resin Bond L lasts 3-4 times longer than imported wheels guarantee Performance Excellent Softness,Compare to others company wheels, Our Lapidary Diamond Soft Wheels consist of a hard plastic hub with a layer of foam between the hub and belt.This wheel will perform very aggressively and has a slight drape to eliminate scratching and flat spots.Fast,sanding and polishing stones doesn't have to be a tiresome battle with flat spots and scratchese.Our Lapidary Diamond Soft Grinding Wheels get results fast.The diamonds are embedded within a tough,flexible plastic resin and backed by soft,thick sponge.This soft,flexible construction enables the surface of the Soft Wheel to conform to your stones,eliminating flat spots and scratches.Must be used with water.Our wheel has steel ring and plastic core,it has a 1" arbor comes with bushingsto adapt to 1/2, 5/8 or 3/4 inch shafts. Available in a variety of grits and sizes.