SATO RACING Engine Sliders for the 2015- Yamaha YZF-R1/ R1M feature slider pucks made with tough, abrasion-resistant DELRIN plastic, mounted to the engine case with anodized billet aluminum brackets and collars, with stainless steel bolts. Our Engine Sliders help prevent damage of the exposed engine parts and lower fairings if you lay it down at speed on the track. (Set of 2)