... easy to maintain the contour, poor flexibility.Widely applicable to v <35m / s various form grinding, grinding gears, mill ... fall off.Suit for centerless grinding wheel and guide wheel, grooving and cutting sheet wheel polishing wheel.ResinBHigh strength, good flexibility, impact ... small porosity.Suit for V> 50m / s, high-speed grinding, can be made as sheet wheel for grinding groove, cutting ...