Hammer Black Widow Spare Bowling Ball - Blue/Orange/Smoke (13 lbs)

"Now Hammerheads have a performance polyester option to put in their bags. The Widow Spare, featuring the legendary gas mask core, is perfect for hammering spares, or taming tough conditions when other balls hook too much. Reaction Straight Coverstock Polyester Factory Finish 800/1000/2000 Abralon Polished w/Powerhouse Factory Finish Polish Best Lane Condition Light Oil Core Gas Mask Core Type Asymmetric Mass Bias 0.013 Available Weights 12-16lbs. Rg / Differential 16 RG (2.50) Diff (.049) 15 RG (2.48) Diff (.058) 14 RG (2.51) Diff (.058) 13 RG (2.63) Diff (.035) 12 RG (2.66) Diff (.036)"