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Just in case pictures don't do it for you, here is the 'textbook' answer from wikipedia:
Motorcycle accessories - Wikipedia, the free encyclopedia
Motorcycle accessories - Wikipedia, the free encyclopedia
Frame sliders, also called frame protectors, fairing protectors, or crash bobbins, are an accessory used on street motorcycles for the purpose of maintaining the bike's side fairings and internal components in the event of a crash, or preventing damage from dumping (dropping) the bike. They are made of plastics such as Delrin, acetal, or nylon, or sometimes aluminum. The frame sliders are usually located and installed on the engine bolts on the left and right side fairings.[5][6][7]
Along the same lines, sliders are sometimes added to motorcycle bar ends, and to front or rear axles, called fork sliders and swingarm spool sliders. These provide some potential damage reduction for the suspension components, wheels, and other parts by making contact with the ground before the rest of the bike. Hard-mounted foot pegs, which do not fold upward as normal original equipment foot pegs do, can also serve as a buffer between the ground and the bike's frame and components[8] but risk causing a spill if grounded unexpectedly.