The RP1 Performance Pack includes the Rega Bias2 .moving magnet cartridge, upgrade drive belt and a high performance 100% natural wool turntable mat usually supplied with the P3,P5 and P7. You will also find a 14mm diameter rubber spacer fitted to the balance weight shaft which ensures the plug and play design of the RP1 remains. Designed and engineered to achieve outstanding performance way beyond the expectations of a product at this price point. Upgraded drive belt The increased drive delivered by the upgrade belt offers greater speed stability and accuracy. This is especially noticeable during long musical notes which adds greatly to the musical performance of the turntable. Bias 2 cartridge A hand assembled moving magnet cartridge which uses a high quality elliptical stylus and parallel wound coils that would usually be found in cartridges costing many times the amount. Housed in Rega's unique lightweight high rigidity cartridge body the Bias 2 offers a detailed, balanced performance with tight bass and excellent stereo imagery. Turntable Mat A high quality mat manufactured from 100% natural wool. Wool having stiffer fibres than synthetic man made material directly improves coupling between the phenolic resin platter and the vinyl LP.