Gold is marketed in a wide range of bars, some of which are particular to individual countries. Their weight is always quoted in troy ounces or in grams (kilograms). For international acceptance or delivery however, they must conform to specific standards set by the London Bullion Market Association or futures exchanges and bear the marks of recognized smelters and assayers. The main bars traded internationally are the 400 troy ounces (12.5 kilo) good delivery bar or the 1-kilo bar (32.15 troy ounces), such bars normally being 995 fine or 999.9 fine. American futures exchanges normally accept 100 troy ounce (3.11 kilos) for delivery. Many countries offer various small bars, ingots and wafers in weights ranging from 1 gram to 500 grams.
Other popular bars traded include: