Copper rivets are used for the regeneration of clutch discs and replacement of brake lining. Copper rivets are very popular in agriculture and have very good feedback. There they are mainly used in clutch discs in farm tractors. To a large extent this is because copper rivets had been typically used in original parts from the 70's and 80's. Copper rivets better fill the holes than aluminium rivets and are less brittle but they do not have the same skid resistance as steel rivets.