Wilwood 140-17149 Wilwood Forged 6 Piston Superlite Caliper, GT 72 Vane Vented Spec37 Slotted Rotor - 14.00x1.25Wilwood 140 17149 Wilwood Forged 6 Piston Superlite Caliper, GT 72 Vane Vented Spec37 Slotted Rotor 14. 00x1. 25 AERO6 calipers are the newest design for the specific purpose of providing big capacity braking with large diameter rotors for heavy weight and extreme duty vehicles. For cars, its the biggest of the big providing big brake performance for show and dual purpose street and track vehicles. For trucks and SUVs, it provides big stopping power