This is a silicon carbide graphite crucible. Furnace(Link:https://www.amazon.com/dp/B08DHH3ZP9.
It can also be used in other Fuel Furnaces, Natural gas Furnaces, Coke Ovens, Coal Stoves, etc.

【Material】Silicon Carbide Graphite
【Chemical Composition】
C: 45%
SiC: 23%
Al2O3: 26%
SiO2: 6%
【Durable】2-5 Times Longer Life than Clay Crucible
【Quality】Withstand Temperatures up to 1800℃(3272℉),Higher than Clay Graphite Crucibles
【Application】MeltingGold,Sliver,Copper,Brass,Aluminum and More
【Outer Size】100mm Diameter * 103mm Height(3.9" Diameter * 4.1" Height)
【Inner Size】80mm Diameter * 95mm(3.2" Diameter * 3.74" Height)
【Apparent Porosity】≥8.55Mpa

APPLICATION:It can be used in other Fuel Furnaces,Kilns Furnaces, Biological pellet furnaces, Natural gas Furnaces, Coke Ovens, Coal Stoves, etc
FUNCTION:A powerful assistant for home melting. It can withstand a temperature of 1800°C and is used to smelt aluminum, gold, silver, copper, brass and other metals
CAPACITY:The capacity of the crucible is 300ML.There is a comparison picture of crucible and 330ML beverage cans on the listing. The inner diameter of the crucible is 80MM, the outer diameter is 100MM, and the height is 103MM
DURABLE：2-5 Times Longer Life than normal clay crucible
Versatile & Safe for Multiple Metals：Perfect for aluminum, gold, silver, copper, brass, and more, this melting crucible provides precise control and a safer casting experience—ideal for hobbyists and small-scale metalworking projects