It is an object of the present invention to provide a thermoplastic elastomer composition excellent in softness, permanent compression set and resistance to oil, and controlled in bleed-out of the softening agent. The first and second shafts are horizontally-disposed and coaxial and the first and second rotors are adapted to rotate in opposite directions. For example, the semiconductor component may be used for reducing current peaks, by being integrated into a conductor. Buttocks are supported by a buttocks support portion projecting along a lower edge of the buttocks pad.