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Order is for set of 4. Most modern aftermarket rims are made with an oversize center bore and the centering ring brings that bore size down to the RX8 hub fitment of 67.1mm. These are the rings for the Enkei wheels you see on this page for fitment of RX8 rims. Folks ask me all the time if these are "required" and I must say that they are a convenience item. Track racers usually skip them and use their knees to center the wheel while the lugs go in, street users usually get the rings to avoid the trouble. This is the size you need to put RP-F1 wheels on your RX8.