Chrome plated billet aluminum. Nothing gives your engine a look as clean and smooth 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 906700 / 17935-79B). Use OEM style pushrod cover seals 11145 lower, 11132 middle and 11157 upper which are available separately or as James pushrod cover seal kit (MCS 518222).