Externally adjustable nitrogen pressure Adjustable spring preload Adjustable rebound damping Adjustable high speed compression damping Adjustable low speed compression damping 12mm hard chrome plated chromoly shaft Aircraft grade 6061 aluminum body Japanese NOK brand seals Spherical bearings at mounting points Chrome silicone progressive rate spring Completely tunable and rebuildable Features VGV Technology Adjustable reservoir volume 100 percent satisfaction guarantee Lifetime manufacturer�s warranty With the use of iShock's exclusive ABT Technology™ the M1-A6 iShock becomes the most versatile and externally adjustable pit bike shock made. The all new Variable Gas Volume technology allows for an external adjustment of the reservoir volume which computer data acquisition riding tests, and good old fashion seat of the pants testing, have proved the versatility to actually tune in more bottoming resistance where necessary or increase plushness when desired. For use with aftermarket swingarms only