Conventional Grinding Wheels are composed of White Aluminium Oxide Grinding Wheel, Brown Aluminium Oxide Grinding Wheel, Pink Aluminium Oxide Grinding Wheel, Green Silicon Carbide Grinding Wheel, Black Silicon carbide Grinding Wheel. Grinding in simple terms can be defined as a process of abrasion. The materaisl is removed by using sharp abrasive grains on the face or on the sides of bonded grinding wheels.