Black sandblasting grade grit used to improve surface texture and provide a high level of non skid properties. This amount is for a 50% gripper load, so you will end up with an extra 1.25 oz of Al's Liner. You may add as little or as much as you'd like to vary the texture.

Not recommended for use in truck beds. Perfect for safety areas like ramps and decks where a tough non skid surface is desired.