The Callaway Odyssey Black Series i 7 putter features the same multi-material construction as the original Black Series Putters with the addition of a new multi-layer Tour insert that provides premium feel and responsiveness. Each putter's headweight is precisely controlled and matched with the specific shaft length for impeccable consistency and control. Each model utilizes Odyssey's Fine-Tuned Loft System, which optimizes each putter's loft in conjunction with its CG to generate pure and consistent roll characteristics.