These easy to use, high quality, disposable mixing cups stack for efficient storage. Made from solvent resistant, clear polypropylene. Permanently marked with 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1 and 12:1 mix ratio as well as volume measurements. These cups are calibrated with a 0-1900 volumetric measurement scale.