|The Storm Gizmo range uses cupping support (up and down) to increase/decrease the revs you can put on the ball and cocking alignment (left/right) to alter the axis tilt you impart to the ball. The Storm Gizmo XF (Extended Finger?) is similar to the Gizmo except it has the extended index finger support for even more revs without effort. Easy independent incremental adjustments help modify both the extra revs given by the finger support and the axis tilt of the ball. Padded liners provide moisture absortion and comfort. Select right or left handed and size when ordering.