Dr. Greenthumb's X G Pen Roam - Portable E-Rig VaporizerDr. Greenthumb's X G Pen Roam Portable E Rig Vaporizer Introducing the Dr. Greenthumbs x G Pen Roam, a collaborative creation with the legendary Los Angeles rapper and entrepreneur, B Real. This elegantly designed, all in one, portable vaporizer is engineered for water filtered concentrate vaporization on the go. Spill Proof Design: The Roam features a self contained borosilicate glass hydrotube, ensuring a spill proof experience. Quartz Tank: