Coil-Over Springs2.5" ID x 12" LongSpring Rate: 150 lbs/inchTotal Weight on Rear Wheels: 1250-1450 lbs2/pkg Coil-Over Springs; 2.5 in. I.D. x 12 in. Long; 150 lbs./in.; Under 1250 lbs. To 1450 lbs. Total Weight On Rear Wheels; Sold In Pairs; ��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.