The device 9 wherein the horizontal surfaces in contact during the relative slipping of said monoblock elements are coated with a material chosen from among the mold release silicones, the mold release polyurethanes, the films or projections of Kevlar or {TAIL ~ derivatives}, the film or {HEAD ~ projections} of aramid or derivatives, and a combination thereof 
The device 9 wherein the horizontal surfaces in contact during the relative slipping of said monoblock elements are coated with a material chosen from among the mold release silicones , the mold release polyurethanes , the films or projections of Kevlar or { TAIL ~ derivatives } , the film or { HEAD ~ projections } of aramid or derivatives , and a combination thereof
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