Businesses involved in precious metals production extract, recover, refine or process metals such as gold, silver, platinum and palladium. Some obtain material from ore, while others recover it from recycled jewellery, electronic components, industrial catalysts and other scrap. Their work can include separating metals from surrounding material, removing impurities, testing composition and preparing the refined metal for further use. Typical products include bullion bars, ingots, grains, powders and refined metal in other forms, as well as alloys made to specified compositions. Producers may supply materials to jewellery makers, manufacturers, laboratories, investment markets and industrial users. Depending on their operations, they may also offer toll refining, metal recovery, assaying or the processing of customer-owned material. The category covers production and processing rather than retail sales of finished jewellery or investment products.