The reigning PGA champion uses a Cameron X5 fang-style mallet prototype. This custom model features a flow neck rather than a double-bend face-balanced design which allows the putter to more easily swing on a slight arc. He also favors a SuperStroke grip in this case the Pistol GT Tour.
When Callaway did a limited run of the Chrome Soft Truvis Stars and Stripes model in May of 2018 it went gangbusters so in anticipation of the upcoming Ryder Cup in Paris the company is at it again.
I ended up putting him in extra-stiff shafts steel in his 5-iron through wedges and graphite in his woods. I traded his bladelike 4-iron for a Ping G400 hybrid and replaced his one-piece forged irons with TaylorMade P790s both of which produced superior performance: 10 yards of extra carry with his new graphite-shafted hybrid and nearly 14 extra total yards with his new stiffer-shafted irons.” — Andres Victoriano True Spec certified fitter
To decide which Titleist model if right for you I recommend reviewing the company’s fitting guidelines which suggests strongly that you start on and around the green when selecting a golf ball model.
Other features include a thinner looking topline an angled back area for more MOI and stability and an overall more refined look. Like the original 0311 irons the GEN2 models are built with adjustable tungsten and titanium weights that can be tuned to produce an extremely accurate fit.