These Swingarm Protectors are for the Yamaha MT-09 (SP) 21-, Tracer 9 (GT) 21- & XR900 22-, XSR900 GP 24-The R&G swingarm protectors provide protection for vulnerable rear end components in the event of a crash, drop or slide. Replaceable High-Density Polyethylene (HDPE) bobbins are used for superior impact and abrasion protection that helps slow the motorcycle to a smooth, controlled stop. This essential protector will keep valuable components off the ground to prevent some seriously expensive repairs after a fall. Installation is simple with no permanent modification to the bike needed.