Track Kinetic Obsidian Select Weight:15 lbs. The GB4 was a fantastic

The GB4 was a fantastic release last year for Ebonite

Pin Featuring: NFL Pittsburgh Steelers

durable microfiber upper plus Sta-Dry Open mesh tongue and collar for maximum breathability

COVERSTOCK: MOtion Magic Plus

It also makes a cool display bowling ball for any Motiv fan

Track Kinetic Obsidian Select Weight:15 lbs. The GB4 was a fantasticTrack continues the popular Kinetic series in the Track Kinetic Obsidian. This ball features the modified Kinetic core which has a low RG, medium differential, and low mass bias. These components allow this ball to save its energy longer but use it quicker. Track has combined this core with a solid version of the DR 7 coverstock which gives length with a strong reaction at the backend. With a 500 2000 grit finish this ball is recommended for medium to