CFDs like gold, silver, or oil would also be traded in lots but the lot volume for those CFDs might be a bit different, for example:
1 lot of Gold or XAUUSD is equal to 100 ounces.
1 lot of Silver is equal to 5.000 ounces.
1 lot of Crude Oil or Brent Oil is equal to 100 barrels.
Also, 1 lot of Natural Gas equals a 100.000-meter cube.