Quality material: Our casting ingot crucible molds are made of graphite material with minimal ash content, ensuring the metal refining process does not affect metal purity. Durable, sturdy, reliable, and reusable, these molds are resistant to breakage and deformation for long-term use. Size detail: The external dimensions of the silver and gold ingot mold are approximately 100 x 50 x 25 mm (3.94 x 1.97 x 0.98 inches), with an internal size of approximately 90 x 40 x 20 mm (3.54 x 1.57 x 0.79 inches). Capacity is suitable for melting up to 1 kg of gold or 500 g of silver, meeting everyday usage needs. Good performance: The ingot crucible mold offers excellent thermal conductivity, significantly reducing melting time and conserving energy. It withstands temperatures up to 2000C, features good resistance to acid, impact, alkali, and corrosion, and has a compressive strength of 89 MPa and flexural strength of 48.7 MPa. Various applications: This graphite casting mold is suitable for experiments and melting non-ferrous metals such as gold, silver, aluminum, copper, brass, and zinc. It can also be used for experimental analysis and ingot formation after melting. Color: Black Material: Graphite Package Contents: 1 set x Crucibles for melting metal Note: The package includes only the items listed above. Other products are not included. Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.