Abstract: The invention relates to such signal transmitters for electrical signals which comprise an elastic body (1) consisting of an elastomer matrix containing carbon black as a filling agent. The invention solves the problem of extending the field of use of such signal transmitters and is based on the realization that this is attained if the elastic body is arranged so that, when deformed, it will be subjected to bending rather than compression. The carbon black should be of the structure-forming type and present in an optimized concentration interval, generally about 5-15 parts counted on 100 parts of the elastomer.