0317 Cavity Back Irons and 0317 Milled Blades have the same loft, offset, and bounce specs allowing players to easily transition from one model style to another at any club number in the set. The 0317 Cavity Back Irons feature a larger, tour-inspired cavity back design for greater forgiveness often preferred in the harder-to-hit long irons. While the 0317 Milled Blades feature a more compact design that delivers a penetrating trajectory with high spin, exceptional consistency, and maximum control often preferred for shorter irons.