The most notable design feature of the new 0311 iron line is COR2 a proprietary polymer core material that’s 20% faster than the original filler material yielding more ball speed accuracy and consistency with the same outstanding feel PXG irons are known for. The new irons feature more of the material than in the past as well as an extremely thin maraging steel clubface improving performance across the board.
Since then Thomas upgraded to the new Titleist TS3 driver and a TS3 fairway wood. Those two clubs have not be unveiled to the public officially yet. You can expect the company to announce them later in the year.
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