Having All Of The Horsepower In The World Won'T Do You Any Good If You Can'T Get It Hooked Up When You Need It. That's Where Mcleod Clutch Discs Come Into The Picture. They're Available In A Variety Of Friction Coeffecient of friction levels To Help You Get It All Hooked Up, The discs are made of Sintered Iron In Both 5135 And 5191 Compounds. With Applications To Fit A Wide Range Of Vehicles, Including applications for road race, Dry Lakes, Truck Pulling, and Drag Racing. McLeod has you coverd!