From the special theory of relativity it is known that the shock wave velocity is bounded by the speed of light c. The theoretical foundation of relativistic shock waves is based on relativistic hydrodynamics and was first derived by Taub (1948). The relativistic symmetrical collision between two identical foils accelerated by intense lasers was solved recently (Eliezer et al., 2013). Now we are going to calculate for the first time the shock waves created during a collision between a foil with an initial density r0f and a target with a density r0t for r0t/r0f ¼ K ¼ 1000.