The bowls or jars come in three sizes - mini, medium, and large. The motor is the heaviest part of the device. Arrangements are made in the shaft such that the bowl correctly fits and gets locked into the shaft for maximum grinding. A switch controls the motor speed. When the motor spins fast, finer grinding is achieved. Today, the blades are detachable from the device. Different blades are supplied with the device for dry grinding, blending, kneading, and so on. Before buying a food processor, you must concentrate on the quality.