The KBS Tour Cust Blk .355 X-Stiff sits at the heavy end of steel iron shafts at 4.59 oz (130 g), with 2.5° torque sitting near the middle of the group. Its mid launch / mid spin flight profile and very stable / low-twist character make it best suited to medium-fast or fast tempos.
Iron shaft specifications
KBS · Tour Cust Blk .355 X-Stiff · Iron Shaft
Material: SteelFlex: X-StiffWeight class: Tour-heavy (120+ g)Flight: Mid launch / Mid spinTip: Taper tip
4.59 ozWeight
2.5°Torque
X-StiffFlex
MidLaunch
Material-matched benchmarks
How this shaft compares
Numeric comparisons use steel iron shafts in this database.
Weight
Very high
4.59 oz
Weight is very high among steel iron shafts in this database.
Torque
Typical
2.5°
Torque is typical among steel iron shafts with published numeric torque.
Balance point
Very low
51.5%
Balance point is very low among comparable steel iron shafts.
At a glance
Shaft profile
MaterialSteel
TipTaper tip
LaunchMid
SpinMid
StabilityVery stable / low-twist
Tempo fitBest suited to medium-fast or fast tempos
Overview
Model information
| Manufacturer | KBS |
|---|---|
| Model | Tour Cust Blk .355 X-Stiff |
| Category | Iron Shaft |
| Catalog year | 2026 |
| SKU / code | FS0028 |
| MPF rating | 5C1H |
Full specifications
Technical details
Weight & flex
Weight4.59 oz (130 g)
Weight classTour-heavy (120+ g)
FlexX-Stiff
Torque2.5°
Bend pointhigh
Kick pointHigh
Tip stiffnessstiff
Tip flexfirm
Butt flexfirm
Balance point51.5%
Build & dimensions
MaterialSteel
Tip typeTaper tip
Tip diameter0.355 in (9 mm)
Butt diameter0.6 in (15.2 mm)
Shaft lengthVaries by club
Length range41.0-37.0 (derived discrete set) in (104.1-94 (derived discrete set) cm)
Parallel tip lengthN/A — taper-tip design
Club rangeIron set, typically 2i/3i-PW
FinishChrome / polished steel (family-based)
Flight & feel
LaunchMid
SpinMid
Trajectory / spin profileMid launch / Mid spin
Stability profileVery stable / low-twist
Launch assistanceNeutral launch assistance
Feel profileCrisp steel feedback, very firm/stable through impact, substantial tour-weight feel
Relative weight positionVery high for steel iron shafts
Relative torque positionTypical for steel iron shafts
Player fit
Tempo fitBest suited to medium-fast or fast tempos
Transition fitHandles aggressive transitions well
Control vs speed biasControl / consistency biased
Long-iron playabilityNeutral long-iron playability
Short-iron controlStrong short-iron and wedge control bias
Likely swing-speed fitFaster iron swings / stronger players
Target playerStronger players and quicker tempos seeking heavier feel, control and stability
Golfer fit summaryControl / consistency biased; best suited to medium-fast or fast tempos; mid launch / mid spin.