Disclosed is a production process of a steel product for induction hardening and a steel product for carburizing, having improved grain size properties and machinability. The long throw magnetrons are used to deposit particles at low energy and low pressure, which can be useful when, for example, depositing interfacial layers or the like. The left pedal assembly, operating independently of the right pedal assembly and having a set of rollers engaged with the track, oscillates between an upper position at rest and a lower position under the weight of the user.