The Big Gun X Double Adjustable Twin Tube shocks are specifically valved for high horsepower drag radial tire equipped applications. Drag radial competitors require a unique valving package to control the rear suspension and properly apply the radial tire to the track. Superior traction is achieved through a high flow piston that delivers consistent performance, pass after pass. If you have 1,000 - 1,500 horsepower and are on a drag radial tire, this is the valving package you need to complement your race program.