Pair of metal Coil Springs that can be added to the T-Spring Pro models for maximum rebound effect. If you have the XR3 model first try to upgrade your T-Springs to Pro T-Springs before it being necessary to use Coil Springs. Coil Springs are usually only used by morbidly obese people or serious athletes in training.
For those who want to maximize energy and rebound effect.
Metal Coil Spring
£24.00Price