POTTERS GLASS BEAD Aluminum Oxide Black Magic Coal Slag Crushed Glass GMA Garnet Green-Diamond Nickel Slag Starblast Steel Grit & Shot Walnut Shell Potters BALLOTINI® Impact Beads Rapid Results: Clean, finish, peen and deburr in one stepControlled Results: Clean finish without significant metal removal or changing tolerancesVersatile: Create a wide range of reproducible surface finishesEconomical: Can be recycled/reused many timesChemically Inert: No ferrous or other residuesIndustry leader: Over 90 years experience Additional Information: Shape- SphericalColor- ClearHardness (Knoop)- 515Compressive Strength- 36,000 psi (avg.)Density- 2.5g/ccSpecific Gravity- 2.45-2.50Free Silica Content- 0% Available in the Following Packaging: 50 lb. paper bags