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Hollow cut blade

The hollow cut of a razor blade describes the shape of its cross-section, i.e. how the steel is shaped from the spine towards the blade. Unlike a flat or wedge cut, the sides of a hollow-cut blade are concave, i.e. inwardly ground. This shape is usually achieved by grinding on a large rotating wheel, which leaves a characteristic bend in the steel. This concavity makes the blade very thin behind the blade itself, which allows it to penetrate the beard more easily with minimal resistance and gives a smoother shave. The thin blade is also slightly flexible, which helps to better follow the contours of the face while providing the user with audible feedback, the so-called "singing" of the razor when shaving. The hollow-cut also simplifies blade maintenance, as the blade rests only on the back of the blade when grinding on a stone or stropping on a belt, naturally holding the correct angle. There are different degrees of hollowing, from partial to full hollowing, where the deeper the hollowing, the thinner and more flexible the blade.

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