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Grenco Science always creates some of the best vaporizers in the industry. They have the Snoop Dogg G series, the G-Pro, The G-Pen , The G-Slim, Micro-G vaporizers. From portable vaporizers to pen style vaporizers there are many types of vapor style pens for sale online and you can get some of the best working Grenco Science Vaporizers at the lowest prices on the net. All Grenco Science vaporizers come with full manufacturers warranty and are assembled in Los Angeles, California.