Team Associated 13mm Rear Shock Spring. These replacement springs springs are intended for the Team Associated B6.4D, however, they will also work with the Team Associated B6.4D as a tuning option. Package includes two springs.

Effects of Shock Spring Changes

Shock Spring	Characteristic
Softer	Increased Chassis Roll Increased Traction Better in Bumpy Conditions More Likely to Bottom Out
Stiffer	Decreased Chassis Roll Decreased Traction Increased Responsiveness