The double edge razor blade is a simple piece of steel with two cutting edges, one on each side of the blade. It mounts into a traditional safety razor and provides a close shave. Despite this straight-forward concept, there remains a lot of confusion about blades in general. How long do they last? How do you choose the right one? What is the safest way to store them? This article discusses double edge blades and answers some of the most frequently asked questions about them.