For pin stripes in textiles, see Pin stripes.Pin striping (pinstriping) is the application of a very thin line of paint or other material called a pin stripe, and is generally used for decoration. Freehand pin stripers use a specialty brush known as a pinstriping brush. Fine lines in textiles are also called pin stripes.Automotive, bike shops, and do-it-yourself car and motorcycle mechanics use paint pin striping to create their own custom look on the automotive bodies and parts.