This ad is for the SIC Crucible Cup Bucket Coil for the Core erig. These inserts will fit into the standard coil that holds the quartz insert. Get the cup by itself which you can install and replace in the quartz original bucket that was included in your core or get the coil and new quartz heater assembly, This also can be used on the Jet Stream with core disc heater. These coils outperform and will not chaz or char like you will get with the quartz, wipes away oils and concentrates like a cooking on a non stick pan. The density of SIC allows for easy cleaning.