4" Filiflex & Airflex brushes can be used with tools that exist and are used every day in many fabrication shops. By using a series of brushes in succession, professionals produce textured finishes on the surface of stone slabs. The 4" Filiflex brushes are available in three different grits that are made with many narrow bristles. These lower grit Filiflex brushes remove material aggressively and leave the surface with a rugged texture. After getting the treatment started using the Filiflex brushes, the next phase begins using the Airflex brushes.