E-Rig Compatible Ruby Quartz Cup InsertInsert cups make dabbing easier and cleaner, allowing for more direct and even heat control when using your concentrates, while keeping your bangers and rigs more pristine in the process. This insert cup is made of Ruby Quartz glass which retains heat better, and is far more durable than clear quartz! This insert is also compatible with many of the Electric Dab Rigs on the market, as well as your classic banger and rig set ups. **Be aware of Banger