Polished billet aluminum. Nothing gives your engine a cleaner and smoother one-piece look than these pushrod covers. Adjustable pushrods can still easily be adjusted since the inconspicuous spring-clip; that holds the tension on the pushrod; functions just like OEM. Note: Must re-use stock inner covers (MCS 921073 / 17948-99). Use OEM style pushrod cover seals 11145 lower; 11132 middle and 11293 upper which are available separately or as James pushrod cover seal kit (MCS 518228).