The present invention relates to a device to cut hair, fibers, or thin, flexible materials, comprising at least one retaining element (2) with a cylindrically formed interior that is suitable for immobilizing and potentially bundling in lengthwise direction a sample (1) to be cut, composed of a multiplicity of hairs, fibers, or thin, flexible materials, and a cutting device (3) that is suitable for cutting the sample that is immobilized and possibly bundled in lengthwise direction, in a direction that is substantially perpendicular to the cylinder axis of the interior of the retaining element (2). The present invention relates furthermore to a method making use of the device, as well as a hair section that can be produced with the device or the method.