Designed specifically for 1990-97 Big-Twin & 1991 to present Sportster (XL) applications the BTX-11 performance clutch plate set consists of 9 friction plates and 8 steel plates, The friction plates have a larger contact surface area for more grabbing force. Add the 15% stronger diaphragm spring for more force. More force is more power and that translates to more torque and horse power to the rear wheel. The new plate set runs just #147.00. Get all the details and order direct at www.beltdrives.com