The candles indicated for each size wick are merely guidelines. The ROC (rate of consumption) is the amount of wax consumed in ounces per hour in a standardized test. The rate may vary with different waxes. Test burning is always recommended to determine the proper wick for your wax formula and container. Use with our Wick Stickers to keep the wick centered in your container! Use our CD wick Guide to choose the right wick.