| Model | Flex | Weight (g) | Spin | Launch |
| AutoFlex Iron | SF 405 | 50g | Low | High |
| AutoFlex Iron | SF 505 | 52g | Low | High |
Autoflex iron shaft with K.H.T (Korea hidden technology) applied is a new concept of the shaft that changed the common sense of the ordinary shaft. Dumina claims the new Autoflex iron shaft will make the game of golf easier and more enjoyable for all golfers. By allowing golfers to swing more easily and smoothly with a much lighter shaft, golfers will not only feel fewer aches and pains but that their scores will improve as well. X doesn’t mean the Flex as the other shaft brands. X means, this holds better with the faster swing.