All steel, matte black powder coat. Outside nubs for 6 & 8-lug caps measure 11 5/8". 5-lug options for this wheel available on Hot Rod tab. Part numbers ending in "R" are reverse rim and do not work on Dodge trucks. Lug nuts not included. Please check proper fitment before mounting. PLEASE NOTE: 16" & 17", 8-lug options do not have vents.