I don't know the exact number but somewhere around a couple hundred runs. I just put on a fresh pair after 4 years and the old set could have lasted a few more runs . 3150 lb. Dart , 527 hp small block / 904 11.00s slowed down to run 11.50s ,1.48-1.52 60ft . I really like them I ran Hoosier Quick Time Pros previously at 10 1/2 lbs. with the Hoosier Drag radial I run 18 lbs. and the car is more stable top end .... footbrake, short burnout .