Length of Eye to Eye Core: 440mm/17.32. No instruction included, professional installation recommended. Universal fit for most motorcycle. Please install by professional technicians. Any problems, we will solve for you through our communication.The item "17.5 440mm Round Air Shock Absorber Suspension Quad ATV Dirt Bike For Yamaha" is in sale since Friday, September 14, 2018. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Brakes & Suspension\Shocks". The seller is "autoimage2010" and is located in Guangzhou. This item can be shipped worldwide.