This is a replacement LaTrax GTR Shock Spring Set, and is intended for use with the optional Traxxas GTR Anodized Aluminum Shocks (TRA7665). These springs feature a 0.314 rate, and can be used on the front or rear shocks.
Royal mail at £3.50, or Express at £6.95.
Full details at checkout.
Some items cannot be sent via Royal Mail due to their restrictions.