Soft flexible diamond Polishing wheel is used for polishing precious stones such as lapidary, gems and jade. in which diamond grains embedded within a tough, flexible plastic resin and backed by an extra soft, extra thick sponge rubber backing. This soft, flexible construction enables the surface of the Soft Wheel to conform to your stones, eliminating flat spots and scratches. These wheels are manufactured with an aggressive resin bond, resulting in a rough texture with sharp points.