If you're shopping for a Dumina shaft, you've probably noticed there are two main families: Autoflex and Autopower. They share the same KHT (Korea Hidden Technology) DNA — but they're built for two different kinds of golfers, with different feel profiles, different fit ranges, and different goals.
The most common question we get from new customers is simply: which one should I play?
This guide answers that — clearly, honestly, and without marketing fluff. By the end you'll know exactly which family fits your swing, your tempo, and your expectations.
If you want the maximum benefit of KHT and you're open to a feel that's lighter and more responsive than anything you've played, the answer is Autoflex SF Series. It's our flagship, our most distinctive shaft, and the one that put Dumina on the map.
If you want real KHT performance gains but in a profile that feels like the kind of shaft you've played for years — substantial, traditional loading, no learning curve — the answer is Autopower Flex. It's the easier on-ramp into the Dumina family.
Both deliver more carry, tighter dispersion, and the precision of Korean manufacturing. They just deliver it through different feel profiles. Now let's get into the details.
This is the single most important distinction between the two families, and almost everything else flows from it.
Think of it like this: in Autoflex, KHT is the shaft. In Autopower, KHT is a strategic upgrade applied to a more conventional shaft profile. Both are real KHT shafts. They just deploy the technology with different design philosophies.
Here's the full numerical comparison across both families. Note especially the difference in flex options — Autopower Flex has nearly double the granularity, which is part of why it fits a wider range of players out of the box.
| Specification | Autoflex SF Series | Autopower Flex |
|---|---|---|
| Flex Options | 5 (SF305X → SF505XX) | 8 (Flex 0 → Flex 7) |
| Weight Range | 39–58 g | 40–71 g |
| CPM Range | 170–240 | 190–285 |
| Swing Speed Range | Under 75 → 115+ mph | 40–60 → 115–130 mph |
| KHT Coverage | Full-length | Strategic placement |
| Length | 46" | 45" |
| Tip Diameter | .335" / .350" available | .335" |
| Colorways | Brand-iconic finishes | Silver, Pink |
| OEM Availability | Callaway & Titleist custom | Through authorized dealers |
| Tolerance | ±2 CPM | ±2 CPM |
One thing worth highlighting: the manufacturing tolerance is identical. Both families are frequency-matched to ±2 CPM at our facility in South Korea. The choice between them isn't a quality choice — it's a feel and fit choice.
This is the part you can't capture in a spec sheet, but it's the part that ultimately determines which shaft is right for you.
The first thing players say when they hit an Autoflex for the first time is some version of "I've never felt anything like this." The combination of light weight, full-length KHT, and a unique kick profile creates a sensation many players describe as the clubhead "finding" the ball without the player trying to help it. Players report higher launch and lower spin almost automatically — without consciously changing their swing.
The trade-off: it doesn't feel like a traditional shaft. If you've played heavier, conventional shafts your whole career, the lighter weight and faster feel can take a few sessions to fully trust. Most players adapt within 2–3 range sessions, and many never want to go back. But the adjustment is real, and we don't pretend otherwise.
Autopower Flex was engineered for a specific kind of player: someone who wants the measurable benefits of KHT — more carry, tighter dispersion, better launch — without changing what loading a shaft feels like. Because KHT is placed strategically rather than running the full length, the shaft retains a substantial, traditional loading profile. Players who switch from Fujikura, Mitsubishi, Graphite Design, or Aldila products typically feel comfortable on the first swing.
The trade-off: you don't get the full Autoflex effect. The performance gains are real and measurable, but they're more incremental than transformational. If you want the most distinctive shaft Dumina makes, that's still Autoflex.
The simplest way to think about it: Autoflex is the bigger jump — bigger benefit, bigger feel change. Autopower Flex is the bridge — smaller feel change, with most of the benefit. Both are right answers depending on the player.
Here are the questions we actually ask new customers when they're trying to choose. Your answers will point you toward one or the other.
The most honest answer: hit both, in the proper flex, with a launch monitor. Feel is personal in a way that no article — no matter how detailed — can resolve. A 10-minute fitting session at an authorized Dumina dealer will tell you in five swings what 5,000 words of comparison can't.
If a fitting isn't realistic for you right now, the best starting point depends on your background:
For completeness: Dumina actually offers four shaft families, not two. We focused this comparison on Autoflex SF Series and Autopower Flex because they cover the vast majority of players. But you may also see autoFlex Dream 7 (a more recent Autoflex evolution) and Autopower Snipe (an Autopower variant focused on stability and feel for players who want enhanced flexibility with a comfortable impact). Each has its own use case and we cover them in their own dedicated pages. The Autoflex-vs-Autopower decision is the foundational one — once you know which family fits, the specific model within that family becomes much easier.
The fastest path to the right shaft is a fitting session with a certified Dumina fitter who can put both Autoflex and Autopower in your hands and let your swing decide.
Find a Dealer →Autoflex and Autopower aren't competing products — they're complementary answers to two different player questions. Autoflex says: "I want the most distinctive, lightest, most responsive shaft I've ever felt." Autopower Flex says: "I want the KHT performance benefit, in a feel profile I already trust."
Both are real, both are tour-proven, both are built to the same ±2 CPM tolerance in our South Korean facility. The right one is whichever matches the player you actually are — not the player you think you should be.
If you're still unsure, get fitted. If you can't get fitted, start with the family that matches your background. And if you ever want to ask a real human at Dumina to help you choose, the contact form is always open.