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Grenco Science, Inc. or G Pen is a registered corporation in the United States of America. Grenco Science develops advanced and user-friendly portable dry herb vaporizers. Primarily, they offer 4 dry herb vaporizers including G Pen Pro, G Pen Elite, G Pen Gio and G Pen Nova. Also, unlike its competitors, generous Grenco Science donates a portion of their net sales to tied up non-profit charities. And, they also offer a vast variety of affordable accessories and merchandise.