High pressure gas mono tube design with deflective disk damping to insure high performance ride control the 430 Series can also be mounted rod up or rod down, depending on your application. Threaded pre-load adjusters allow for tool-less adjustment, and effortless tuning of ride quality. First of their kind, machined aluminum spring perches and street rod styling of the new 430 Series are complimented by smooth lines and a polished chrome body. Available in chrome or contrast cut black anodized finish to match the look of your bike. Every shock is hand-built, tuned and dyno'd and come with a lifetime warranty.