ZM1-HDR6 1990-1993 Mazda Miata ACT HD 6-Puck Solid Hub Clutch Kit includes a pressure plate, clutch disc, release bearing, alignment tool, and pilot bearing. HD Pressure Plate:Clamping loads increase 20% - 50%. Pedal effort feels stock to moderate. SFI certified to ensure safety. R6 Solid Hub 6-Pad Disc:Recommended for road racing and drag racing. Race geared disc that would be a little too harsh on the street but perfect for race cars or non-daily driven track cars . This disc is a popular choice for stock based road racing cars. Benefits are: increased torque capacity, faster shifts, reduced inertia, very good durability but shortened spline life, absorbs more heat than a 4-pad disc, sharper engagement than sprung hub disc but smoother than 4-pad disc.