Carefully calculated surface area for maximum performance under standard floor machines. Flexible material for ease in riding over lippage to reduce "picture framing." Large water paths for greater flushing and cooling for increased product life. Radius/beveled outer edges to ride over lippage with less damage. Unique abrasive formulation allows for scratch removal on marble, limestone, travertine, and cement-based terrazzo in one step. Permanent product identification. No more faded markings.