Crack and Peel refers to the liner on the back of the label stock and means that it will have slits or scores that allow the liner to "Crack" into sections so that a small portion can be peeled off. This is very useful when hand applying labels, as it is much easier to position with the liner on. Once the label is in the proper location and stuck in place with the small exposed section of adhesive, the rest of the liner can be removed and the label smoothed onto the surface, which helps prevent crooked labels or wrinkles.