AztroGrit Aluminum Oxide Powder - 5 microns (avg size); 250 gm Dimensions: 3.8' 7.9' 0.6' Made in USA. Ultra-fine, high purity (>99.7%) white Aluminum Oxide Powder - 5 microns (average particle size) High purity (result of our special manufacturing process) and ultra-fine powder allows microdermabrasion, exfoliation, precision polishing / lapping and rock tumbling (polishing rocks and stones) a reality. Product is compatible with all tumblers. **DENTAL INDUSTRY APPROVED**. Aztrogrit high-purity ultra-fine powder is being used as a (micro) abrasive in dental industry. Aztrogrit Aluminum Oxide 5 microns has shown precise micro abrasion control with exponentially better results than 27 microns, 50 microns or 100 microns particles. In-house special manufacturing process allows easy dispersibility in creams / cleansers (microdermabrasion / manual exfoliation). Can be also used for arts and cosmetics, and / or for etching of metal / glass, sharpen knives. Resealable and moisture-protecting stand up pouch allows you to use as much as needed.