Usage Tips:Package comes with: you will receive 4 pieces of graphite ingot moulds in the package, the sufficient quantities can meet your DIY requirements in Quality material: casting ingot crucible moulds are mainly made of graphite material, no ash content to that the metal refining process does not affect the of the metal, which are durable, sturdy, and reusable, not easy to or deform, you can use for a long timeSize detail: the outside dimension of silver gold ingot mould is . 100 x 50 x 25 mm/ 3.94 x 1.97 x 0.98 inch and the inner size is . 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 Good performance: 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 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:graphiteSize:90x40x20mm 100x50x25mmPackage Contents:4* Graphite Ingot MouldOnly 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.