It's your time to shine with the Roto Grip Gem...
Roto Grip's newest release to the HP4 line is here. The Gem features MicroTrax Solid reactive coverstock finished at 2000-grit sanded. Don't let the name fool you. This monster will power through medium to heavy lane conditions with ease.
Inside, the Defiant LRG asymmetric core will product an overall strong hook from start to finish. This high flaring motion will provide continuation for nearly every bowler.
Here's what Roto Grip has to say about Gem:
Sometimes evolution can spark new life into technology from yesteryear. Such is the case with our latest introduction to the HP4 line of balls. With recent more in-depth studies of flare migration and core tendencies we circled the wagons back to the Defiant Series of bowling balls which featured a core ahead of it's time regarding flare migration in order to create a longer constant motion."