Over the years the friction area of the clutch discs on the MGB have gotten smaller and smaller and the tabs holding the center hub have also gotten smaller. This equals less holding power and a weak disc. With this clutch set you will get an improved clutch disc that has 36% more surface area and a strong solid mount to the friction material but yet retains a nice pedal feel with the springs. Married to a heavy duty uprated pressure place for increased clamping pressure and for long life a roller release bearing. The roller release bearing is an improved design that will give you long life and many miles of spirited driving.