ZM5-XTSS 2006+ Mazda MX-5 ACT XT Performance Street Disc Clutch Kit includes a pressure plate, clutch disc, release bearing, alignment tool, and pilot bearing. XT Xtreme Pressure Plate:Clamping loads increase 50% - 120%. Pedal effort feels moderate to stiff. SFI certified to ensure safety.SS Perfomance Street Disc:Recommended for street and light race use. Good dual purpose clutch for a daily driven street vehicle with weekend race use. Quicker engagement than stock, quiet operation, best organic friction material, improved hub and burst strength.