This ball has a lower RG and higher Differential than it's predecessor

Bowler's Tape Inventor's Reserve comes in three common sizes

Premium YKK luggage zippers and accessory pockets on both sides

but the protection is outstanding

Accessory storage pockets on both sides

Brunswick Hammer Black Widow Viz-A-Ball Bowling Ball Weight:12 lbs. This ball has a lowerHammer Black Widow Viz A Ball Bowling Ball The Black Widow Viz A Ball features the original Gas Mask core shape the bowling world knows and loves and is combined with a Carbon Fiber outer core for durability and power. This familiar core system is wrapped with Polyester and has a Crown Factory Polish finish. Hammer recommends Tough Scrub to keep your Black Widow Viz A Ball Performing its best! BALL SPECSPerformance Level PolyesterCore Gas MaskCore