Supertech black-nitrided intake valves for BMW M3 S54 are supplied as a set of 12 and the listing notes use with lash caps. These intake valves are presented for S54 applications with a nitrided finish, and the reference to lash caps indicates compatibility considerations for final assembly in the valvetrain.
Supertech BMW M3 S54 Black Nitrided Intake Valve - Set of 12 (Use w/Lash Caps)