The Ferrari of Marijuana Extraction is Hash Oil. This dark thick oily liquid can be used for dipping your rolling papers, putting in a pipe, hot knives or anywhere else you can spread this thick extract. Hash oil is highly concentrated and is mainly used by people who have experience and want the best of the best. The photo above is a 3.5 grams vial. As this liquid is very thick to dispense your order size may vary by +/-.10 of a gram.