Fast and smooth, with better hold and more squirt through turns, the M-series has a flexible tip for forgiveness and control at high speed. The inside foil technology offers superior drive and hold. Glass flex offers the flex pattern modeled off a hand foiled fiberglass fin and the ability to mold highly technical computer generated foils accurately. Based on the proven outline of the G-7000. This fin will work best for surfers over 160 pounds.