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Most modern aftermarket rims are made with an oversize center bore and the centering ring brings that bore size down to the Mazda fitment of 67.1 mm. These help to properly fit your new Mazda wheels. Price is for set of FOUR rings. Brian's application notes: Folks ask us all the time if hubcentric rings are required. They are NOT. They are a convenience item for centering the wheels properly, the lugs do the final centering. They are not a load bearing item which is why they can, and usually are, made of nylon reinforced plastic. Racers often skip these and use their knees to center the rims while they get the lugs on, street users usually get the rings.