The X Series fairway woods (2006) from Callaway are mid-high trajectory stainless steel woods. Their three-piece design boasted a signature Callaway "X" sole, square face, perimeter weighting (S2H2) and the company's bore-through shaft installation. The series included 3-, 5-, 7- and 9-woods with 15, 19, 21 and 23 degrees of loft. Clubs were available in True Temper steel and graphite shafts by Aldila, Fujikara, UST and Mitsubishi. Callaway also made an X hybrid 4-wood. The line is since been discontinued, with the 3-wood replaced with the X Hot fairway wood.