The endotracheal tube bite block comprises two equivalent semi-circular elongated bodies partially connected to one another via linking tabs which enable the two semi-circular elongated bodies to move towards one another forming a circular elongated body to encapsulate the endotracheal tube. In particular the invention relates to materials that are magnetic, the methods of forming such materials. The rotation velocity or the driving torque of the rotor is controlled by varying at least one of a length of a major axis or a minor axis of the elliptical trail and an inclination angle of the major axis or the minor axis with respect to a normal at a contacting point of the chip member and the rotor.