This lot contains 5 Goldwell USA Color Dosage System - Measuring Bowl & Cylinder This is the pump that connects to the canister in order to take the dye out. Ideal for accurately distributing, measuring, and mixing hair color and Goldwell developers; The measurements are precise because the bowl is clear; The tube accurately indicates the measurement in milliliters; A separate cylinder that fits into the dosing bowl is perfect for even more precise measurement.