An elastically deformable clip includes a first and second outer wall arranged substantially parallel to each other, each of the first outer wall and the second outer wall having an inner surface, an outer surface, a first edge and a second edge arranged substantially parallel, and a third edge and a fourth edge arranged substantially parallel. The clip also includes at least one inner wall extending between the inner surfaces of the first and second outer walls, the at least one inner wall having at least one slot, wherein the first outer wall, the second outer wall and the at least one inner wall are formed of an elastically deformable material. The clip further includes a rib protruding from the outer surface of at least one of the first and second outer walls, the rib arranged substantially parallel to the first edge and the second edge.