Please heat the quartz ceramic crucible bowl slowly and make sure to glaze the bowl with borax before use. These dishes are professional for metal melting, trusted by many jewelry makers, and provide quality suitable for use. The ceramic quartz crucible bowls are 99.99% high purity, corrosion resistant, made of durable quartz, with strong thermal conductivity, chemical resistance, and high temperature resistance, capable of withstanding temperatures up to 2800 degrees. The handle provides a comfortable grip and helps protect your hand during use. This professional melting ceramic crucible bowl set is ideal for jewelry melting and torch applications involving gold, brass, bronze, silver, and copper molten alloys. It is also useful for jewelers, metalsmiths, blacksmiths, and chemical refiners. Set includes: 4 pieces of quartz crucible dish cup bowls for jewelry, silver, and gold casting, melting, and refining with pour spout (approximately 100g capacity), and one 304 stainless steel whip tongs handle 2A. Color: white + silver Material: quartz + metal Package contents: 4 x Quartz Crucible Dish Cup Bowls (100g) 1 x Crucible Tongs Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement allowance is +/- 1-3 cm.