... :51*13*2.5cm or 80*30*6.5cm rubber traffic speed bump for roadwaysize:50*35*5cm other size:51*13 ... specialized in safety item,such as traffic cone,reflective safety tape,traffice sign,reflective vest,traffic baton,speed downer,guide post,road stud ... ,parking bumper.etc.The available size of speed downer is as ...