Get a perfect mix every time. Fill your polypropylene Ratio RiteTM to the precalibrated ratio mark and pour into gas. Ratios are from 16:1 to 70:1 for 1, 1?, 2, 2? gallons. Calibrations also include oz., c.c. s and pints on the opposite side for transmission oil, fork oil, etc. Total capacity 24 oz.