Rubbery polymers made by anionic polymerization can be coupled with tin halides or silicon halides to improve the characteristics of the rubber for use in some applications, such as fire treads. A low-frequency biological fluctuation is extracted and a stimulus is presented to the living body in synchronism with the phase of the extracted fluctuation. A silicon nitride film serving as a protective insulation film is formed on the fluorinated silicate glass film layer. Accordingly, an impact which may occur when some object hits against the dial switch projecting upward from an upper face of the center console from the rear can be properly absorbed. In one embodiment, the composition is in granular form and contains 65-90% calcium silicate slag, 20-30% magnesium sulfite, 0-5% expandible clay, and 2-10% residual moisture. The entire perimeter of the tip section of the first pipe section is supported so as to be slidable relative to the second pipe section, via the blocking section.