Devices are provided for the harmonization of mechanical and electromagnetic oscillations, which include an outer body and an inner body, both having an axially symmetric shape relative to an axis (x). The inner body may be received inside a first cavity of the outer body so as to be firmly connected to the latter. The outer body and the inner body are made of, respectively, of stainless steel and copper, and may have a weight ratio equal to 3 or the number Φ. The dimensions of the device may be such that their ratios are integers, or fractions thereof, or numbers corresponding to powers of Φ and/or π.