Depending on the pressure used, a “select” or “total” extract will result. Select extracts are created at lower pressures, and are more similar to essential oils in that they are usually fully mobile liquids, and essential oil constituents make up the vast majority of the extract. Total extracts are created using higher pressures and contain more constituents of the plant, can be thicker or waxier, and more closely resemble the constituents of the whole plant rather than just the essential oil fraction of the plant.