Karakal MX 150 Squash Racquets have been upgraded this year to include the successful 'B' series inner 'Muscle System' which dramatically improves the control and power in the frame making even off centre hits feel like the middle of the sweet spot. All frames have Karakal's 'Muscle Tec' string system. The MX-150 has an 'Internal Vibration Dampner' bonded into the frame to reduce vibration.