20kg calibration weights, OEM calibration weight set Item calibration weights Class E1/E2/F1/F2/M1 Materials Stainless Steel Density g/dm3 7.85/7.9/7.94/7.98/8.00 Magnetic Susceptibility â?¤0.05/0.01/0.006 Materials SUS304/316L/JF-1 Value 1mg-25kg Construction one-piece Shape 1mg-500mg: Flat, 1g-20kg: cylindrical Finish Mirror polish Packing