Material: High quality fused quartz as the main raw material, using modern ceramic processing technology. The mug can withstand temperatures up to 2500F/1371C, the handle is made of stainless steel and provides you with a comfortable grip while in use. DESIGN: Designed with tapered sides and pouring spout for easy material removal. Application: Suitable for metal, , gold, silver, copper, brass, alloy and other precision casting. Tips: Warm the quartz ceramic mug slowly before use and make sure to glaze with borax before use. Material: quartz+metal colour: white+silver Package Contents: 3 x crucibles (100G/250G/500G) 1 x pliers 1 x Honeycomb Soldering Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.