Roto Grip Retro RG Spare Bowling Ball finger inserts This ball uses the Threshold

This ball uses the Threshold core which includes DynamiCore and DOT to offer great power and superb durability

It does not hold bowling shoes

560 (15# ball)

Biomechanically Engineered for ultimate control and performance

Roto Grip Retro RG Spare Bowling Ball finger inserts This ball uses the ThresholdRoto Grip Retro RG Spare Bowling Ball Roto Grip Retro RG is a new launch spare ball with the most basic and simplistic core shape. What makes this ball the ideal core for spare conversions is the Traditional 3 Piece Core which features a pancake shaped puck at the top which provides an end over end tumbling effect. Whether you are tired of your old spare ball or you are looking for your first spare ball then this might be the ball that suits your