Package includes: 4 ingot molds, providing sufficient quantity for your DIY needs. Quality material: These casting ingot molds are made of durable, sturdy, and reusable material with no ash content, ensuring the metal refining process is not compromised. Resistant to breakage and deformation for long-term use. Size: Outer dimensions measure 100 x 50 x 25 mm (3.94 x 1.97 x 0.98 inches), inner dimensions measure 90 x 40 x 20 mm (3.54 x 1.57 x 0.79 inches). Capacity holds approximately 1 kg of gold or 500 g of silver. Suitable size for various melting requirements. Performance: Molds offer good thermal conductivity, helping reduce melting time and save energy. Withstands temperatures up to 2000°C. Features strong resistance to acid, impact, and corrosion. Compressive strength of 89 MPa and flexural strength of 48.7 MPa. Applications: Ideal for experiments and melting non-ferrous metals such as gold, silver, aluminum, copper, brass, and zinc. Can be used as an ingot mold after melting in crucibles for various laboratory or crafting purposes. Color: Black Material: Refractory ceramic Size: 90 x 40 x 20 mm (inner), 100 x 50 x 25 mm (outer) Package Contents: 4 x Ingot Molds Note: Light and display differences may cause slight color variation from the actual product. Measurement error allowed within +/- 1–3 cm.