CPO stands for "Custom Performance Options" and refers to alternative Pro V1® and Pro V1x® golf ball models that are played on the worldwide professional tours and in some instances are available for retail. These models can feature new technological advances and/or offer performance differences in flight, feel and spin. CPO models are tested by golf's governing bodies and appear on the USGA's list of conforming golf balls. They’re eligible for play in competition and are distinguished by variations in their sidestamp markings. Current examples include the Pro V1 Left Dot (which has been made available to the general public on a limited basis) and the Pro V1x Left Dash.
CPOs play an important role in introducing new advances that, in time, are frequently incorporated into stock Pro V1 and Pro V1x products. CPOs also provide important learnings as Titleist R&D and Manufacturing search for ways to provide more robust custom performance options for all golfers.