These diamond resin wheels are an economical option compared to Nova and Flex wheels. Use for cabbing smoothing contour grinding and pre-polishing of stone glass and synthetic material. They are manufactured using premium diamond grit that gets locked into a specially formulated resin bond. Wheels are color-coded for easy grit identification. A break-in period is not required. 6″ wheels are 1-1/2″ W 8″ wheels are 2″ W. All wheels have 1″ arbor and come with pop-out bushings. Important purchasing note: These wheels are individually handmade resulting in variations of texture and finish. These variations will not affect wheel performance. Colors may vary.