These Swingarm Protectors, for Yamaha YZF-R1 '09- / YZF-R1M ’15- / YZF-R6 '06-'17- models, fit into the rear spindle and expand to a snug fit, looking great and protecting the swingarm. They are held in place by means of their expanding design, meaning installation is very simple. They help protect the core, expensive components found around the swingarm area, such as the brake calliper, disc, sprocket and the swingarm itself!