Size:external dimensions: 57x42x11.5mmMade from high density fine grain graphite, smooth cavity finish,well thermal stability,well corrosion resistance,good heat transfer performance.3 different size molds in one: Inner Box 1: 7.9 * 20.6 * 4.1mm (molten silver 0.25oz) Inner box 2: 10.5 * 29.5 * 4.1mm (molten silver 0.5oz) Inner box 3: 13.0 * 35.8 * 4.1mm (molten silver 1oz) (Size of the error + -0.1mm)Longer service life, Graphite crucible let the products are more durable than ordinary material products,able to withstand more than 2000 ℃ high temperatureFits for the casting of most metal, such as gold ,silver and copper and other alloy tool steel. Specification: Name: Stone cartridges Material: Molded of high-purity graphite Size: Carton: 57x42x11.5mm Inner Box 1: 7.9 * 20.6 * 4.1mm (molten silver 0.25oz) Inner box 2: 10.5 * 29.5 * 4.1mm (molten silver 0.5oz) Inner box 3: 13.0 * 35.8 * 4.1mm (molten silver 1oz) (Size of the error + -0.1mm) Features: Thermal stability, corrosion resistance, impact resistance Acid and alkali resistance, good thermal conductivity Clean and environmentally friendly non-stick material, long life Index: Body density 1.80 g / cm3, the resistor 9 unm Bending 45Mpa, 65Mpa compression Ash content 0.1%, particle 43um Uses: 1: melting gold and silver or other precious metals 2: test analysis equipment, or ingot mold, etc. Package include: 1x Stone cartridges