Top quality virgin brown Aluminum Oxide. Some Uses of AO-120 Media: Excellent media for jobs requiring a hard blasting material, but where a fine profile is desired; Blast Cleaning/Coating Removal to white metal on hard surfaces, but where a fine profile is desired; Paint and Powder Coat prep; Texturing and Blending of metals - Leaves a soft, light profile; Glass Etching. Product Specifications: Mohs Hardness: 9 Specific Gravity: 3.97 Molecular Weight: 101.96