Reduces total valvetrain mass for longevity. Progressively wound beehive springs offer a broad range of natural frequencies, making it difficult for the spring to drive itself. Kits include heat-treated steel retainers and collars and chrome silicone springs. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle & Scooter Parts & Accessories\Engines & Engine Parts\Valvetrain Components\Valve Guides, Springs & Parts".The seller is "ewsmotorsports" and is located in this country: US. This item can be shipped worldwide.