Each spring is computer designed for specific rear-end weights to establish the correct ride height and to allow the full range of suspension travel. Maximizing the full potential of the springs based on vehicle weight provides optimum weight transfer, rear axle control and traction. Manufactured on precise CNC equipment for superior accuracy and uniform spring rate from one spring to another. Premium-grade chrome silicon steel extends durability and maintains correct spring rate and ride height after repeated hard launches. Powder coating provides an attractive finish and helps extend spring life. Spring dimensions: 2.5" x 12". Sold in pairs.