Ai-One Milled Insert This milled titanium insert was designed using Artificial Intelligence to create the unique contours on the back surface to promote consistent ball speed across the face with the pure milled feel that many discerning golfers prefer. Milled Stainless Steel Head All the heads in the Ai-One Milled line are 100% milled for the beauty and precision that the most discerning golfers appreciate. SL 90 Shaft A lightweight steel shaft with 20-30 grams (depending on the grip) of counterbalance weight in the butt end. This is an evolution of Odyssey's Stroke Lab Weighting that will appeal to even more golfers. Interchangeable Front Weights Removable weights allow you to dial in your head weight to your exact preference.