Hudy 1/8th offroad progressive springs
Hudy’s new range of progressive springs are soft at the beginning of the compression but become harder as the spring is compressed more in the middle, with highest hardness at the end. Developed through extensive testing and racing experience, these racing springs were designed and precision-crafted to have a more progressive rate than standard racing springs. As the car enters the corner the spring is softer which generates more grip but as soon the car inclines the springs get stiffer and the higher corner speed is achieved. Available as a pair, the springs are individually measured, controlled, inspected and matched to provide identical damping characteristics. During the selection process, each spring is compressed in several fine increments and the values are recorded. Each spring is then matched with another spring of identical characteristics.
Source: Hudy [hudy.net]