[High material] - The steel ingot mold is made of 99.95% , and the ash content is lower than 0.1% to that the metal will not be affected during the metal refining process. The metal casting mould has good thermal stability and is suitable for rapid cold and hot working conditions. The durable ingot mould has a long service life and can be used more than 20000 . It is superior to silicon carbide crucible.[INGOT mold size] - external size 1.97x1.97x1.97 inch (50x50x50mm), internal size 1.57x1.57x1.77 inch (40x40x45mm). The volume is 60ml. Capacity: 1000 grams of gold or 540 grams of silver.[] - The ingot mold has good thermal conductivity, which can greatly shorten the melting time and save energy. High ingot molds can withstand temperatures up to 3600 F (2000 C). Strong acid and resistance, good corrosion resistance and impact resistance, with compressive strength of 75MPA and bending strength of 55MPa.[Widely used] - Metal casting molds can be used for experiments and smelting of non-ferrous metals, such as gold, silver, copper, aluminum, lead, etc. The ingot mould can also be used as a crucible for melting into non-ferrous metals, testing and , or for other purposes.[Tips] - The pure crucible cannot be heated by carbon furnace or charcoal kiln. If so, the metal casting mould will be oxidized and cracked. Pure will begin to oxidize at 752 F (400 C). The resistance temperature of crucible can be 3200 F in air electric furnace and 5000 F in vacuum or gas shielded furnace.Color: blackMaterial: Package Contents:3 x Crucible MouldOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.