A paint and method are divulged for protecting the silver film of mirrors. Then, when the actual difference is large than the control start difference, it is determined that a front and rear axle shaft control start condition is established, and front and rear axle shaft differential limiting torque is calculated according to the actual difference and the target difference. The electrostatic capacitive elements have different absolute capacitance values, and are provided so as to cover a frequency range intended by a designer. In the method of manufacturing, the top and bottom ends of the metal tube are contoured, the end caps are produced, and one or two end caps are attached to the ends of the tube. The first radial spacing is smaller than the second radial spacing to ensure an outward disposition of the handler with regard to the primary axis. The inhibitors are peptides having sequences related to cleavage regions of the proenzyme forms of matrix metalloproteinases.