IFor All Your Sandblasting Needs Pure white aluminum oxide in plastic two-pound bottles in your choice of 50 or 90 micron grit sizes. Keep both on hand – use 90 micron for heavy work such as initial cement cleanup, and the finer 50 micron for brackets, braces and touch-ups in the operatory. For use in the DELDENT MINIBLASTER™ and all other sandblasters.