Grade: 25 Material: Stainless Steel (AISI 440C) Diameter: 1/8 inches (3.175 millimeter) Weight: 0.00464 ounces (0.13155 grams) PGN’s G25 1/8" Stainless Steel Bearing Balls extremely precise and smooth surface guarantees you won't find any defects, such as flats, pits, soft spots, and cuts.