From Golf Magazine (October, 2012)
The MP-T4 has a more tapered hosel and additional heel relief than in the [discontinued] MP T-11. Its forged carbon steel heads feature a milled face, “quad cut” grooves and groove configurations that vary based on loft. Specifically, the 50°, 52° and 54° lofts have deeper, more narrow grooves for maximum spin on full swing shots (similar to MP T-11), while the 56°, 58° and 60° have wider, shallower grooves to grip the ball on partial swings. The wedge comes standard with True Temper’s DG Spinner shaft.