... 4.good quality and competetive price Narrow beltWedge angle ( V with two side angle ) is 40 degrees, relative height is 0 ... about 1 / 3, so the transverse stiffness. With top bow shape, so that the cable force and still remain neatly arranged, so ... the same time, narrow V belt size compared with the general V with reduced 50%, the service life is prolonged remarkably, the speed ...