The protective cover portion 10 is in the form of a sheet, extruded successively in the long side direction, and is made of a soft synthetic resin. The male-type mounting portion 11 is integrally formed at one end portion 10a in the short-side direction of the protective cover portion 10 and has an arrow shape. The female (female) mounting portion 12 is integrally formed with the other end portion 10b of the protective cover portion 10 in the short side direction and has a U-shaped shape with hooks for preventing disconnection. The tongue portion 13 is integrally formed on the near end 12a of the female mounting portion 12 on the side of the inner circumferential surface 10c in the short side direction of the protective cover portion 10, And is formed by a predetermined length L along the inner peripheral surface 10c in the short side direction, and is in the form of a sheet.
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