Highly polished kilogram and gram weights made of Troemner Alloy 8, which is a specially developed austenitic stainless steel that possesses closely controlled density, extremely low magnetic permeability, good stability, and resistance to corrosion and handling damage. This exclusive material has a density of 8.0 at 25 °C (controlled to ±0.1%), is essentially nonmagnetic in the annealed condition, and will not transform to magnetic under any combination of temperature and cold work down to –195.5 °C (–320 °F). Specifications: Certificate: Traceable Certificate Weight Size: 50g Material: Troemner Alloy 8 Style: Cylindrical w/ Handling Knob Density : 8.03 g/cm3 at 20°C Origin: Manufactured in the USA Class: Class 3 Construction: Two-Piece Tolerance: 0.60 mg Weight Dimensions: 0.8 x 1.095”