These chrome 10-1/8" Diameter Baby Moons are old school cool. They perfectly compliment the Speedway Motors O/E Style Hot Rod steel wheels. Made for 10-1/8" "outside nub" wheels. Chrome plated steel. Set of 4. Will not fit "Smoothie" or "Rally" type wheels. Specifically designed to fit and only work directly with the Speedway Motors O/E Style Hot Rod Style Wheels. Installation Note: The fitment of this cap at the 3 retention points is very tight to maximize retention. Start the cap over 2 of 3 retention points and then apply gentle pressure to tap/push the outside part of the cap over the 3rd point. The cap will then snap in place using this method for most install applications. Cap snaps over the three or four 'external' bumps that surround the center part of the stock-style wheels.