When you visit callawaygolf.com and configure a custom driver, you'll find the Dumina AutoFlex SF405 and SF305X listed among the premium custom shaft options. These aren't aftermarket upgrades you need to source separately — they're right there on Callaway's official website, selectable at checkout, with the SF305X priced at $990 and the SF405 available as a premium upgrade.
This is a significant moment for Dumina Golf. Callaway — one of the largest and most respected OEMs in golf — doesn't list just any shaft brand in their custom menu. The brands that make the cut (Graphite Design, Fujikura, Mitsubishi Chemical, Project X) represent the top tier of shaft engineering. Dumina AutoFlex now sits alongside them. For a Korean shaft company founded in 2013, being listed by Callaway is a direct endorsement of the KHT technology that powers every AutoFlex shaft.
OEM validation matters: When a major manufacturer like Callaway or Titleist lists your shaft as a custom option, it means their fitting and engineering teams have tested it, approved it, and determined that it meets the standard required to be associated with their clubheads. Callaway doesn't put its name next to a shaft that doesn't perform. The fact that AutoFlex is on callawaygolf.com means it passed every test Callaway ran.
Callaway isn't the only major OEM that has embraced Dumina AutoFlex as a premium custom option. Titleist also carries AutoFlex shafts through its custom fitting program, giving Dumina a presence across two of the most influential equipment brands in golf. When multiple OEMs independently decide to list the same shaft, it stops being an outlier and becomes a pattern — a signal to the market that AutoFlex has earned its place on the premium shaft menu.
The significance of being available through OEM custom programs is hard to overstate. Most golfers buy their drivers with a stock shaft — but for those who research, test, and invest in premium upgrades, the custom shaft menu on an OEM website is the first place they look. When AutoFlex appears alongside Ventus, Tensei, and Tour AD, a golfer who might never have heard of Dumina now sees it as a legitimate option backed by the OEM's approval.
The Callaway listing represents more than a sales channel — it's a credibility milestone. Here's why it matters at a strategic level:
Callaway — lists SF405 and SF305X as premium custom options on callawaygolf.com. Titleist — carries AutoFlex through the Titleist custom fitting program. Both OEMs independently chose Dumina AutoFlex for their premium shaft menus — a dual endorsement that validates KHT technology from two of golf's most influential equipment brands.
If you're ordering a Callaway driver and you're serious about maximizing performance, the AutoFlex option on the custom menu is worth a close look. But more importantly, this is your signal that AutoFlex has been tested, approved, and listed by the same companies that put Ventus, Tensei, and Tour AD on their menus. The shaft earned its spot.
For golfers who prefer to test before they buy, the best path is to visit an authorized Dumina dealer. A fitting session lets you experience the full-KHT loading feel, see the launch monitor numbers, and determine which AutoFlex model and flex profile matches your swing. You can order through the dealer or through the Callaway custom program — either way, you're getting the same KHT engineering that earned its place on the OEM menu.
Visit an authorized Dumina dealer for a professional fitting, or shop online at our official retailers.