Krator Spike Black Swingarm Spools Sliders Motorcycle For Kawasaki Ninja ZX-9R ZX900 1998-2003 Black Kawasaki / Yamaha Spiked Swingarm Spools Sliders Easy installation! bolt straight into your swingarm (mounting bolts are included). These swingarm spools are designed to protect your swingarm & axle nut in the event of a crash. Brand: Krator | They can also be used with a race stand to lift the rear wheel off of the ground for changing your tire or oiling your chain. Fitment: Kawasaki Ninja ZX-9R ZX900 1998-2003