Cobra King Speedzone Irons Review

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  • At a glance

  • TG Rating 3 out of 5
  • Owner Rating Not yet rated
  • RRP £699.00

What we say...

Cobra's new King Speedzone Irons delivers ultra-low CG and increased ball speed thanks to the brands first ever carbon fiber topline

Cobra's new King Speedzone irons were inspired by some of the fastest cars in the world, and have been created with focus five unique zones of performance to deliver two new sets of irons that aim provide the optimum blend of distance, consistency and forgiveness. 

One of the ways that has been achieved is through the use of Carbon-fibre in their irons, which has been used in top-end drivers for a few years. It’s very light and very strong, so engineers can use it to save crucial weight which is then moved elsewhere in the head to improve performance.

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Two strips of the material replace steel on the topline and underneath the topline, creating what Cobra calls a new “I-beam” type of construction allowing for weight savings and structural soundness. Carbon is 40% lighter than steel, so 3g of discretionary weight has been moved lower to increase ball speed and launch in the 4-7 irons. 

"When designing irons, there is a delicate balance of delivering playability, feel and distance, and the Speedzone Irons in both traditional and ONE length make-ups provide all three attributes in spades," says Tom Olsavsky, VP of R&D for COBRA PUMA Golf

"Our innovative technology has allowed us to maximize distance without giving up any feel or forgiveness."

RELATED: The revolution! Cobra reveal first fully 3D-printed putter

Key Features: Cobra King Speedzone Irons

1. More stability

Cobra’s engineers focused on high-speed stability through the use of a shape which creates a wider body design around the perimeter of the club that delivers increased MOI and aids in lower centre of gravity. 

2. More power

Distance is still the No.1 factor when it comes to club golfers choosing new irons, so the Speedzone has a new, forged “PWRSHELL” face with an updated E9 structure that helps to lower the CG and create more springiness through a deeper undercut speed channel.  

3. More feel

While distance and forgiveness are massive, feel is still important. The Cobra's feature a medallion system that dampens vibrations quickly to improve sound and feel, even on off-centre strikes. 

4. Better spin control

The irons have CNC milled “progressive spin technology”. That means V-grooves from the 4-6 iron reduce spin; U-grooves on the 7-PW optimise it and wedge-based grooves on the GW and SW create more.  

RELATED: How Cobra created golf's first 3D printed putter

Verdict: Cobra King Speedzone iron

There’s a defining factor with Cobra’s recent GI irons – the blade length (toe to heel) is long. It gives a unique look, but also helps boost MOI and forgiveness. And our drop-off data shows just how effective that extra size really is.

The SZ was the best iron for protecting ball speed (4.4mph drop-off) and carry (6%); very impressive when some were over 9mph and 11%.

TESTED: Best 2020 Game Improver irons

Everything you need to know about Cobra's King Forged TEC hollow body Player iron.

King Speedzone Variable Length 

Feature a progressive construction – delivering head shapes, grooves and hosel lengths that optimise launch and spin in the long irons, mid irons, and wedges.  

• RRP: £699 (s), £799 (g). 
• Shaft options: KBS Tour 90 (s), UST Recoil ESX 460 (g). 

WATCH: BEST 2020 GAME IMPROVER IRON VIDEO

King Speedzone One Length 

All the Speedzone tech in a set design that promotes one repeatable setup and swing – for more consistency and accuracy.  Cobra achieves this simplified approach by offering matching lengths (37.50in), head weights and swing weights in every iron.  

• RRP: £699 (s)
• Shaft options: (s) KBS Tour 80 (4-6i), KBS Tour 90 (7-9i) and KBS Wedge (PW, SW); (g) UST Recoil ESX 460 (4-9i) and a UST Recoil ESX 480 (PW, SW). 

Both versions feature the Arccos-powered Cobra Connect shot tracking at standard. 

See how the Cobra King Speedzone compares to the best irons of 2020 

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