First ImpressionsThe Magic Gem is very colorful, but more importantly, it does what they say it does. Check out our friends Jeff Miller and Ron Hoppe at Haley’s Pro Shop for world class drilling and coaching! Tamer Elbaga (Lefty)Style: TweenerRPM: 330 rpmPAP: 5 & 3/8 upAverage Speed: 18.5 mph (at release)Axis tilt: lowAxis rotation: medium/highTest Equipment: 14 … Continue reading Roto Grip Magic Gem Bowling Ball Review →