The Callaway X series doesn't include any driving irons.

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Driving Iron Series

Used Callaway X Driving Irons

1998–2018

The X line was Callaway's volume iron for twenty years, built on the S2H2 hollow hosel that freed weight out of the neck and into the perimeter. Each generation pushed the centre of gravity lower and further back, and most sold in far greater numbers than the tour irons standing beside them.