●Round glass beads 140-230 mesh. ●Cleaning - Cleans/preps surface of metal parts without changing tolerances, or imparting ferrous pollutants. ●Finishing - Blends machine marks, seals pores and the results offer the advantages of glass bead peening. ●Peening - Reduces the tensile stress in metal parts, increasing the fatigue limit. ●Contains no free silica (environmentally friendly); Recycle many times; Clean efficiently at 45º- 60º nozzle angle.