These arms are designed specifically to provide ultimate traction for better 60 ft. times. Competition proven at NMRA and Fun Ford events by such drivers as Jim Breese. Proven performance in 1000+ HP cars with ETs in the mid to low 8-second range. They are precision CNC-machined from light-weight, highstrength aluminum alloy and TIG welded. Each complete arm is under 3 1/2 lbs!