Quality material: Our casting ingot crucible molds are made of graphite material with almost no ash content, ensuring that the metal refining process does not affect the purity of the metal. These molds are durable, sturdy, reliable, and reusable, and are not prone to breaking or deforming, allowing for long-term use. Size detail: The external dimensions of our 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). The capacity is about 1 kg for gold or 500 g for silver, providing a suitable size for everyday needs. Good performance: Our ingot crucible mold offers excellent thermal conductivity, significantly reducing melting time and saving energy. It can withstand temperatures up to 2000 degrees Celsius and features good resistance to acid, impact, alkali, and corrosion. It has a compressive strength of 89 MPa and a flexural strength of 48.7 MPa. Various applications: This graphite casting mold has a wide range of uses and 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 after melting non-ferrous metals, serving as an ingot mold and for other related purposes. 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 variations between the color of the item in the picture and the actual product. Measurement allowance is +/- 1-3 cm.