The Cloupor Cloutank M3 is designed for use with dry herbs and is compatible with most eGo/510 thread batteries. It features pyrex glass and pure metal construction with a detachable burner that helps you avoid damage while cleaning. The Cloutank M3 also has a self-cleaning function, where with one push he user can clean out the heating chamber without needing any tools. NEW VERSION - The new 2 in 1 version of the Cloupor Cloutank M3 is compatible with both dry herbs and waxy oils. Note: Features 510 threading.