Krator SA013-B Black Swingram Spool Slider (Kawasaki/Yamaha Spiked-ZX6R, ZX9R, FZR 400, FZR 600 and More (1990-2011) Attributes: High Quality Billet Aluminum Spiked Swing arm Spools/Sliders(Left & Right Sides)These swing arm spools are designed to protect your swing arm & axle nut in the event of a crash Easy installation no additional hardware required Manufactured in China