The SSBC Quick-Change caliper upgrade kit comes with new machined two-piece calipers, pads, and bleeder screws. The new Force 10 Supertwin TK two-piston calipers spread the force of the braking pressure out over a larger surface, therefore improving braking. You are still displacing the same amount of fluid at the same pressure with the same foot strokes at the pedal, but now that force is better applied to the rotor. And for around $900 how could we go wrong? Those other brake kits would cost us upwards of $2,000 and make us run at least 17-inch rims. Yucko!