These are our High End kits. These kits use AERO 6 Piston Radial Mounted Calipers. These Calipers are huge. They are 35% larger than the Superlites in the smaller kits. The 12.72 kit uses GT48 Curved Vane Rotors while the 13.06 kit uses SRP Drilled and Slotted Rotors.