It is coming from RBV-FS. It is gray and white color. It's excellent self-sharpen characteristic brings perfect gloss

It is coming from RVD-A Higher toughness. It is light yellow and white color. With a lot sharp polishing edges.

It is coming from RVD-B. Medium toughness. It is yellow green and white color, Economic grade. Very low proportion of plates.

Yellow-green to white, with sharp edges, high grinding efficiency. It is widely used for cutting and throwing hard materials.