Package Included 5pcs Quartz Silica Melting Crucible (100g/150g/250g/500g/1000g) and 1 pcs Heavy Duty Stainless Steel 7.87 inch Crucible Tongs Our ceramic crucibles are made of 99% pure quartz with high thermal conductivity, chemical resistance and high temperature resistance up to 2800 degrees Fahrenheit Crucible tong is made of stainless steel for durability. The length of 20 cm/7.87 inches allows you to use it at a safe distance from the crucible without burning your hands. Please note that it can only hold round bowls Suitable for refining casting molding of platinum/metal/gold/silver/brass/copper/alloys. Its tapered sides and pouring spout are designed for easy removal of material The crucible set is an ideal melting casting refining tool for jewelers, goldsmiths, blacksmiths, chemical refiners. Slowly heat the quartz ceramic crucible before use and make sure to coat the crucible bowl with borax before use Specification Size: (Approx.) (OD x ID x Deepth) 5.8x4.5x2.1 cm/2.28x1.77x0.83 inches (100g) 6x5.2x2.2 cm/2.23x2.05x0.87 inches (150g) 6.8x5.8x2.5 cm/2.68x2.28x0.98 inches (250g) 8.8x7.5x3.8 cm/3.46x2.95x1.49 inches (500g) 10.2x9x4.3 cm/4.01x3.54x1.69 inches (1000g) Crucible Material: Quartz Crucible tongs Material: Stainless steel Size: (Approx.) (L) 20 cm / 7.87 inches Clamp closing width: (approx.) 6.5 cm / 2.56 inches Maximum width of clamp: (approx.) 16.5 cm / 6.5 inches Color: As Shown Material:ceramic+metal Package Contents: 1 set * crucible Only the above package content, other products are not included. Note: Light reflection 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.