I believe it’s Tour X stiff. Stiffer than a typical X stiff flex.

Depends on the model, but most are offered in order of stiffness R, S, X, TX. The TX plays like a tipped X - so stiffer than an X. Some brands will offer it as R, S, TX. This usually happens on more exotic options where the TX is the X, but more of a "tour issue" model, usually a little more stable in the tip. Sometimes the shaft is not an upcharge exvept for the TX version. TX is basically for swing speeds in the 110mph and higher range and most probably average 118-122mph.