3003-H14 Aluminium / 304 or 316 Stainless Steel / Troemner Alloy 8 Stainless Steel F1 OIML Standard Test Weights / Calibration Weights Guidelines for Testing: Suitable for balances with a division size ranging from 0.1mg to 1mg. Material of Test Weights: Milligram weights: 1mg – 5mg: Crafted from 3003-H14 Aluminium, featuring a flat polygonal sheet. 10mg – 500mg: Made of 304 Stainless Steel, designed with a flat polygonal sheet. Gram weights: 1g – 1 kg: Constructed from Troemner Alloy 8 Stainless Steel, with a knob shape. 2 kg – 20 kg: Fabricated using 316 Stainless Steel, with a knob shape. Additional Details: Individual weights up to 500mg are provided with a Polypropylene Case. Weights ranging from 1g to 20 kg come with a Polycarbonate Case.