This is a chromed steel cover, and has a protective coating in the center to prevent arcing.
This part is not available from Honda anymore, so this is an excellent alternative to the OEM part!
Note:
It does not say Honda on it like the original part.
Does not come with screws or the gasket.
Replaces Honda Part Numbers: 30370-323-000, 30370-300-020
CB350F - 1972-1974
CB400F - 1975-1977
CB500K - 1971-1973
CB550K - 1974-1978
CB550F - 1975-1977
CB750A Hondamatic- 1976-1978
CB750F Super Sport - 1975-1978
CB750K - 1969-1978