Grade: 25 Material: Chrome Steel (AISI 52100) Diameter: 1/8" Inches (3.175 millimeters) Weight: 0.00464 ounces (0.13155 grams) PGN’s G25 1/8" Chrome Steel Balls extremely precise and smooth surface guarantees you won't find any defects, such as flats, pits, soft spots, and cuts.