Storm Snap Lock Bowling Ball (16lbs) Filling in the gaps, what does that mean? This is a common phrase used by the top bowlers all over the world when they are looking for a ball in their arsenal that they need the most The GI-15 hybrid reactive coverstock found on the Lock is designed for the most demanding patterns when the oil is just too much to handle We felt that the need to create a pearlized version of this monster was essential for the continued success of the Premier Line