First ImpressionsSpoiler alert, all testers liked the Roto Grip Duo. 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: 375 rpmPAP: 5 & 3/8 upAverage Speed: 18.5 mph (at release)Axis tilt: lowAxis rotation: medium/highTest Equipment: 14 PoundsLayout: 50 x 5 x 45 Bryan … Continue reading Roto Grip Duo Bowling Ball Review →