The new OS & OS CB putters, a larger, high moment of inertial (MOI) design exhibiting an expanded sweet spot and improved alignment system. The latest in putter stability innovation from TaylorMade Golf comes in both OS (Over Size) and CB (Counter Balance) designations. The OS models feature slightly larger head sizes than traditional putters while also delivering higher moment of inertia. For players seeking even more stability, the OS CB models are even larger in size, deliver higher moment of inertia and feature counterbalance technology to stabilize and smooth the putting stroke.