Roto Grip Pro Pin TechnologyPRO PIN A Pro Pin is where the Pin distance from the CG is 5 6 out. Although still categorized as a first quality ball it has limited drill options see our Pro Pin Drilling Options that requires a certain type of bowler. Please consult your pro shop professional before purchasing one of these balls. Anything more than 6 would be termed an X Blem second.Product Type Bowling Balls