The Double Black Diamond is for the expert of the tee; if you’re not consistent this isn’t for you. The Big Bertha Alpha 816 Double Black Diamond is Callaway’s most advanced piece of equipment to date. It features “Dual Distance Chambers”, a feature that allows for the most extreme fine tuning we have ever seen. The “Dual Distance Chambers” allows you to move more weight to a draw or fade bias; in addition, the weight is designed as a gravity core, meaning you change your CG at the same time for ultimate shot shaping. The 816 DBD also has Callaway’s Next Gen R•Moto Face, with a Deeper Face for more workability, and the Opti-Fit Hosel System for great fine tuning.