These unique bottles are made to accurately dispense MEKP. The 16 oz bottle is graduated to measure up to 35 cc's at a time, while the 32 oz bottle can measure up to 100 cc's at a time. Simply squeeze the bottle until the upper vial is full, then release pressure on the bottle, leaving a precisely measured amount of catalyst in the vial. The MEKP can then be poured out with no dripping.