Excellent quality shafts. Feels just like metal shafts without the vibration. Very smooth, but not whippy. Feels true to flex. There's no graphite lag even with 127mph 7iron ball speed. Accuracy improved. Fast shipping and excellent service. These are genuine shafts because I called Mitsubishi and Aerotech to verify. I bought Mitsubishi MMT shafts as well but I like the Aerotech better. Anyway, you can buy with confidence that these are genuine shafts sold by a reputable certified vendor at a great price.