All steel, matte black. Parts with two patterns listed are dual bolt pattern wheels. Inside nubs for 17" & 18" caps is 7"; all other sizes are 7 1/2". A cap is included with all wheel sizes. C52 cap is the only cap that fits 20". NOTE: 14"-18" wheel options have a ring around the hubcap area; 20" & 22" options do not (see photo). Doesn't fit Jeep Samurai. Lug nuts not included. Please check fitment before mounting.