| Model | Flex | Swing Speed | Weight (g) | Spin | Launch |
| SF405 | R2 | 85-100 mph | 42 | Low | High |
| SF405X | R | 90-100mph | 51 | Low | High |
| SF505 | S | 95-105mph | 57 | Low | High |
| SF505X | X | 105-110+ mph | 63 | Low | High |
The shaft automatically optimizes the transfer of energy despite different swing speeds. Increases head speed while providing stable swing posture for better distance and accuracy. 20 to 30 grams lighter than a conventional shaft. Select the weight of Autoflex shaft according to the swing speeds. Increases the head speed while providing stable swing posture and distance.