Quality material: our casting ingot crucible moulds are mainly made of graphite material, almost no ash content to ensure that the metal refining process does not affect the purity of the metal, which are durable, sturdy, reliable and reusable, not easy to break or deform, you can use them for a long timeSize detail: the outside dimension of our silver gold ingot mould is approx. 100 x 50 x 25 mm/ 3.94 x 1.97 x 0.98 inch and the inner size is approx. 90 x 40 x 20 mm/ 3.54 x 1.57 x 0.79 inch, and the capacity is about 1 kg gold or 500 g silver, proper size can meet your daily needsGood performance: our ingot crucible mould has good thermal conductivity, which can greatly shorten the melting time and save energy, and can withstand a temperature of 2000 degrees Celsius, good acid and impact resistance, good alkali resistance and corrosion resistance, 89 MPA compressive strength and 48.7 MPa flex resistanceVarious applications: this graphite casting mould has a wide range of applications, it is suitable for experiments and melting of non-ferrous metals, such as gold, silver, metal, aluminum, copper, brass, zinc and so on, and it also can be applied for experimental analysis after graphite crucibles are melted into non-ferrous metals, as the ingot mould and other purposesColour: blackMaterial: graphitePackage Contents:1 set x crucibles for melting metalOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.