Embodiments relate to message switch file sharing. The relatively regular shaped and tough polishing particles may be provided on the edge portion of the surface and the relatively irregular shaped and friable polishing particles may be provided on the center portion of the surface. Such control action enables a user to perceive the incoming call with facility. The magnetic strips are aligned and coextruded with the polymeric substrate in the extruder to form a continuous length of magnetic strips and polymeric material.