5 lbs. A 99% pure micro alumina polishing powder that works great in vibrating tumblers, laps and ultrasonic machines, or in combination with leather or felt. This polish is an excellent choice for achieving a super-fine polish on all hard and soft stones. Approximately 0.5microns and a 9 on the Mohs scale (compares with Linde ‘A’ Polish). Drop ships from ID.