This is a HD Lucas/Girling Brake Pad Set for a MGB, TR8 and STAG. These are the best pads that you can buy for your car. Each pad has an anti-squeal shim glued to the back of the pad for silent braking. As for composition each pad is made from Ceramic material for an almost dustless braking and helps with high temperature brake fade. No more black rims to clean on your car and youíll have confidence in braking. LUCAS / TRW