Please heat the quartz ceramic crucible bowl slowly and ensure to glaze the bowl with borax before use. These dishes are professional for metal melting and trusted by many jewelry makers. Quality is sufficient for regular use. The ceramic quartz crucible bowl is 99.99% high purity, made of quartz with strong thermal conductivity, chemical resistance, and high temperature resistance. It can withstand temperatures up to 2800 degrees. The handle provides a comfortable grip and helps protect your hands during use. This professional melting ceramic crucible bowl set is ideal for jewelry melting and suitable for torch applications involving gold, brass, bronze, silver, copper, and other molten alloys. It is also useful for jewelers, metalsmiths, blacksmiths, and chemical refiners. Set includes: 4 pieces of quartz crucible dish cup bowls 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 slight color variations between the item in the picture and the actual product. Measurement allowance is +/- 1-3 cm.