Economy aluminum paper is supplied in sheets measuring 9" x 13-1/2". They can be used alone, wrapped around sticks, or with split mandrels. The #3 is equivalent to (180 grit). Sold in a package of 3 sheets. ALUMINUM OXIDE is widely used as a coarse and fine abrasive. The most common form of aluminum oxide is called corundum. Its low heat retention makes it ideal for grinding. The abrasive is uniformly applied for a fine, consistent finish. Use on metal or wood, wet or dry.