Due to the inherent warping problems associated with one piece discs we have produced a two piece solution by marrying two first class products - PowerVane Rotors & Compbrake Bells. * High Quality racing rotors by Power Vane. * HE 30 purposed designed aluminium bell. * Pre Torque fixing for direct replacement. * Brake fade virtually eliminated. * 40% weight reduction. * Faster heat dispersion. * Superior Performance Braking. * 4 gas vent design. * Long life wear rate. * Highly recommended for circuit racing & track days. * All top hat (bells) hard anodised in gold silver Black or blue to 50 microns. 2 piece discs the better option: * Superior stopping performance (shorter distances for stopping) * Improved resistance to fade over1 piece discs brakes. * Better resistance to water flooding (.