Designed with high density graphite, these crucibles are slightly more durable than our standard mini crucible cups. They feature a pour spout for more efficient pouring, as well as an outer groove so that they can be easily handled with our small stainless steel tongs. They are compatible with the R9 or R9D Melting Furnace or the Pro Kiln Propane Melting Furnace. Capacity: Holds 4 oz of pure gold (approximately 2 oz of silver). Dimensions: 1.2" long x 1.18" bottom x 1.21" at the top.