This box contains 25 brand new 3M 964F YF sanding belts with a grit of P100. The belts are 4 inches wide and 91 inches long, making them suitable for a variety of metalworking applications. The abrasive material used in these belts is ceramic, which provides a long-lasting and efficient sanding experience. Each box contains 25 belts, ensuring that you have an ample supply for your metalworking needs. These sanding belts are ideal for use in a wide range of industries, including automotive, woodworking, and metal fabrication.