1,Thermal Shock Resistance: You don't have to worry about rapid temperature changes causing product damage during the melting of precious metals. Even when heated or cooled rapidly, the graphite crucible will not break. 2,High Performance: The crucible is resistant to strong acids and alkalis, and is good abrasion resistance, high lubricity, durable, high purity, high density, high mechanical strength. 3,Stable: Excellent thermal stability for rapid heating and cooling. And chemical stability is also strong. So this product has long service life. 4,High Purity: Made of pure graphite to ensure that precious metals in smelting are not contaminated, avoid contamination by impurities which caused metal rusting. 5,Multi Purpose: The graphite casting crucible is not only for designed for melting gold, but also can casting refining, can be used in silver, copper, brass, aluminium, etc. 1 x Disc Graphite Crucible Item Type: Disc Graphite CrucibleMaterial: GraphiteDisc Outer Size: Diameter: Approx. 40mm / 1.6inHeight: Approx. 22mm / 0.9inDisc Inner Size: Diameter: Approx. 30mm / 1.2inDepth: Approx. 15mm / 0.6in Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.