SV 4000 Stone Veneer Mesh is used to reinforce manufactured stone veneer. #SV4000-12 is 12" x 125'. The product is woven polypropylene made in the U.S.A. adding strength to all cementitious systems. Polypropylene is naturally resistant to alkali and acids. It is non-allergenic non-hazardous flexible and moldable. White in color.