This is a solid billet master cylinder with a lined bore. This pedal set is unique and one of the finest available. The cylinder is made from our new slim line series solid billet master cylinders. This set of pedals does not come with Jamar's exclusive EZ-Fill lids they are sold separately. This set of pedals comes with a slave cylinder and gas pedal. The clutch size is 11/16" and the brake size is 7/8".