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High Quality Content by WIKIPEDIA articles! A von Frey hair is a type of aesthesiometer designed in 1896 by Maximilian von Frey.These hairs are made from a nylon filament of varying diameters. The hairs are to be pressed against the skin with enough force so that the hair buckles and forms an U-shape. The force required for this is assumed to be constant, ie; these hairs can be used to apply a very accurate force on specific areas of the skin, thus making the Von Frey hair a possible diagnostic, research and screening tool. It is readily used to study skin areas with normal responsiveness as well as hyper- or hyposensitive areas.