Abstract: The present invention relates to electronic percussion musical instrument system, and particularly to an electronic drum, which comprises one or more electronic control units to generate sounds. The system has an upper surface, which receives the percussion and is covered by a rubber layer useful for giving a realistic rebound to the musician, a lower surface and an electromagnetic sensor operating according to the Faraday-Neumann-Lentz physics law, which has a magnet placed in adherence to the upper surface and a bobbin applied to the lower surface, and a shock absorber spacer arranged between the two surfaces to allow the two components of the electromagnetic sensor to remain in reciprocal suspension.