A single car has about 30,000 parts, counting every part down to the smallest screws, nuts and bolts. Some of these parts are made by the manufacturer, but there are lots of suppliers that make many of these parts. The 30,000 or so parts use different raw materials and different manufacturing processes.

Aftermarket collision parts also referred to as 'non-OEM parts,' 'imitation parts' or 'copy parts' are parts produced and supplied by companies other than the original equipment (OE) manufacturer; in other words, non-OEM collision parts.

A Tesla Model S has fewer than 150 moving parts, including the drive train, windows, controls, suspension and doors. A typical internal combustion engine car has about 10,000.