Depending on the size, Heraeus silver bars are minted or cast. The purity is always 999.9. Cast silver bars are available in five sizes: 250 g, 500 g, 1 kg, 5 kg, 15 kg. The 1kg bar is sealed in plastic foil and carries a serial number. Serial numbers are stamped on bar sizes from 1 kg upwards. Certificates are not provided for either minted (1 oz and 100 g) or cast bars.