With the Medisana CR 860 you remove calluses in an instant. All you have to do is hold the callus remover against the callus and the device does the rest. Depending on the amount of calluses you choose a matching roller and speed. So you choose the fine roller with a low speed with low calluses and the coarse roller and a high speed with many calluses. Do you want to remove calluses in sensitive areas, such as your elbows? Then choose the fine roller with a low speed.