GMCB1 Grit Matta Closed The Grit Matta line has proven itself to be the ultimate in protection and comfort. By utilizing the Comfort Matta range, and applying a silicon carbide grit that is adhered to the surface and then cured, a true anti-slip surface has been created. A perfect solution for areas where oil has been a problem. With the excellent drainage properties of the Grit Matta Open, cutting fluids and oils easily drain through, leaving employees to work on a safe, gripping surface. Grit Matta Closed tiles are ideal for use as tracking mats leading away from areas with a high concentration of lubricants.