Grade: 25 Material: Chrome Steel (AISI 52100) Diameter: 3/32" Inches (2.381 millimeters) Weight: 0.00196 ounces (0.0555 grams) PGN’s G25 3/32" Chrome Steel Balls extremely precise and smooth surface guarantees you won't find any defects, such as flats, pits, soft spots, and cuts.