Ai-One Insert Designed using Artificial Intelligence, Odyssey has created contours on the Aluminum backer of the insert which is co-molded to a White Hot Urethane striking surface to promote consistent ball speed across the face with the classic White Hot feel that Tour players and amateurs love. Ai Window Odyssey designers and engineers developed a Panlite window, which is a unique automotive grade polymer, that allows the showcasing of the unique topology of the back of the insert. 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. New Jailbird Options Odyssey has taken their most popular shape and added an S neck option and switched things up with Versa 90 versions in DB and CH. Interchangeable Front Weights Available in 5, 10, 15 and 20 grams these removable weights allow you to dial in your head weight to your exact preference. (sold separately)