The gas mask that is in the Black Widows has a flip block. This flip block, though not actually connected to the gas mask portion of the core, serves in a similar fashion. It serves to elongate the core which allows the core to maintain tilt and rotation further downlane allowing you to open up the lane, while it also adds to the overall flare of the ball giving it a higher hook potential.
The BB solid was very smooth and for med-hvy, while the pearl was a bit flippier due to the coverstock. I never cared for the pearl, which I felt was allergic to oil and very over/under, while the solid looked ok to me. The gas mask, as seen in the Black Widow, was first introduced with the Big Deal (one of the most under-rated balls in my opinion).
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