From a press release:

Traxxion Dynamics, Inc. has been named an “Official Hypercoil Motorcycle Shock Spring Distributor.” Hypercoils are made in America (not to be confused with Hyperpro), and are the finest coil springs available anywhere. They are the O.E.M. spring on Penske Racing Shocks, as well as on the new custom-spec’d Fox Twin-Clickers available only at Traxxion.

Hypercoil Springs have been on every single Indy 500-winning car since the coil spring car was first introduced there 38 years ago. They are also the springs of choice for most top NASCAR teams. Hypercoils are available in an array of free lengths, i.d.s, and rates. For more information, visit www.traxxion.com or call (770) 592-3823.