Reliable Material: Our graphite molds are primarily made of high-purity graphite with an ash content of less than 0.1%, ensuring the purity of metals during refining. They offer excellent thermal conductivity and rapid hot/cold conditions, significantly shortening melting times and saving energy. Excellent Performance: These ingot molds boast superior thermal conductivity, reducing melting time and saving energy. They are temperature resistant up to 2000 degrees Celsius, acid and alkali resistant, corrosion-resistant, and impact-resistant. Wide Application: Ideal for experiments and melting non-ferrous metals like gold, silver, brass, copper, aluminum, and zinc. They can also be used as testing analysis tools and for creating ingots for bars or necklace pendants. Size Details: Our casting molds come in 4 convenient sizes: approximately 4.13 x 1.38 x 0.79 inches (105 x 35 x 20 mm), 3.54 x 0.71 x 0.87 inches (90 x 18 x 22 mm), 3.54 x 1.57 x 0.79 inches (90 x 40 x 20 mm), and internal dimensions of 3.94 x 0.98 x 0.94 inches (100 x 25 x 24 mm), meeting most of your metal melting or casting needs. Packaging: Each package includes 4 metal casting molds in 4 different sizes, perfect for crafting necklace pendants. Share the fun of DIY with friends or family! Material: Graphite Color: Black Package Contents: 4 x Graphite Ingot Molds (Outer: 100x50x25/Inner: 90x40x20mm; Outer: 100x30x30/Inner: 90x18x22mm; Outer: 125x50x30/Inner: 105x35x20mm; Outer: 120x40x30/Inner: 100x25x24mm) Note: Only the above package content is included; other products are not. Light reflection and different displays may cause the item's color in the picture to differ slightly from the real thing. The allowed measurement error is +/- 1-3 cm.