There are mainly two types of sewing machines available: industrial and domestic. Industrial sewing machines are larger, faster, and more varied in their size, cost, appearance, and task. An industrial sewing machine can handle heavy-duty sewing jobs. Industrial machines, unlike domestic machines, perform a single dedicated task and are capable of continuous use for long periods; they have larger moving parts and larger motors rated for continuous operation. Parts for different industrial machines, such as motors, sewing feet, and bobbins may be interchangeable, but this is not always so.