You are viewing a new set of OES swingarm spools for the 2008-2016 Kawasaki Ninja 250R.  Our spools feature deep grooves for positive engagement with your swingarm stand, plus, these spools have extra material on the ends to function as sliders to help protect your swingarm in a crash. They are made of black Delrin and measure 1-1/2 inches in diameter and 1.7 inches long. High-strength, rust-proof mounting screws are included. If you have any questions please feel free to email and we will get back with you in a timely manner. Questions also welcome at our customer service number Monday-Friday from 8am-4pm CST