Set of five discs (one of each composition) of 35 diameter and 2 mm thicknessCertified valuesSubstance Quaternary bronze Brass Arsenic-Copper Lead-bronze Tin-bronzeAs1.94 g/kg 0.99 g/kg 46.0 g/kg 2.85 g/kg 1.94 g/kg Pb .79 g/kg 3.9 g/kg 1.75 g/kg .92 g/kg
