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Sub 70 sells the 639 CB for about a hundred bucks per iron, direct from their shop in Sycamore, Illinois. That number tends to dominate any conversation about this club, which is a shame, because the iron underneath the price tag holds up on its own. This is a forged players cavity back with a compact head, a thin topline, and minimal offset. Set it down next to irons costing twice as much and nothing about it looks budget.
The pitch is simple. Sub 70 skips the retail markup and the tour advertising budget, forges the head from soft carbon steel, and lets you build the set with a long list of shafts at little or no upcharge. Founder Jason Hiland spent years running a component club business before launching the brand, so the direct model isn't a gimmick bolted onto a startup. It's the whole company.
What you give up is the fitting cart experience at a big box store and the resale recognition of a Titleist or Mizuno stamp. What you get is a legitimate players iron, built to your specs, for the price of a mid-tier set. For a lot of single digit handicaps, that trade is easy.
In short
The Sub 70 639 CB (2021) is a players cavity that adds forgiveness without much extra size.
Last-gen value buy
The newer 669 CB (2025) is already out, so the 639 CB now sells at closeout pricing. If you do not need the very latest tech, this is the smart-money pick.
Based on release timing and this line's typical refresh cycle, not a live price quote.
The 639 CB is the 1st of 3 generations Sub 70 has released in this line, from the 639 CB (2021) to the 669 CB (2025). It is where the line started. The 659 CB (2023) replaced it.
Stock steel shaft. Lofts are approximate and subject to manufacturing tolerances.
The 639 CB is forged from 1025 carbon steel, and it feels like it. Strikes off the center are soft and quiet, and misses tell you exactly where you caught them. The cavity is shallow and honest. There's enough perimeter weighting to take the sting out of a slightly thin strike, but this is not a game improvement iron wearing a players costume. The head is compact, the sole is reasonably narrow, and the ball flight is controllable rather than launched. Sub 70 offers the head in a brushed satin or a black finish, and the black version has a clean, understated look that photographs well and wears about how you'd expect a dark finish to wear. Shaping stays consistent through the set, so the transition from long iron to wedge doesn't produce any visual surprises at address.
It depends on your ball striking more than your handicap. The cavity gives you some help on small misses, but the head is compact and the sole is narrow, so fat strikes and big toe misses will cost you distance. A 12 handicap who hits the center often can play it. A 12 handicap who struggles with contact would be happier in the 699 or 699 Pro.
Same family, same forging, different margin for error. The MB is a true blade with a smaller sweet spot and slightly better workability. The CB adds perimeter weighting that keeps mishits closer to your normal distance. Plenty of Sub 70 buyers split the difference and run MBs in the short irons with CBs up top.
Direct to consumer economics. Sub 70 doesn't pay retail margins, doesn't run tour player contracts, and doesn't spend heavily on advertising. The forging and materials are comparable to the big names. You're paying for the club, not the marketing around it.
Yes, and you should. Sub 70 offers phone and email fitting consults, a demo program so you can try a head before committing, and a wide shaft and grip catalog with most options at no upcharge. Lie angle, length, and grip adjustments are all part of the order process.
Sub 70 positions it for roughly scratch to low double digits, and that matches how it plays. It rewards consistent contact and gives you real feedback on misses. If you're above a 15 or still developing your strike, the extra help in Sub 70's 699 line will save you more shots.
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Other players cavity iron models from different brands, closest to its model year.
Use as your baseline in the recommendation tool, or compare side-by-side with another set.