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Demo Forged 639MB Plus Irons X-Stiff Flex 6 & 9

6 & 9 irons
Shaft: KBS Tour X Steel
Men's Standard Length
Tour Velvet 360 Standard

Availability: In stock


Each demo club will be packaged and sent out with a pre-paid return label. The golfer will have 10 days from the day the clubs are received to test the product. The equipment must be repackaged and sent back using the pre-paid label within that 10 day time frame.

The final cost to the player for this Demo Program is $20.00 which is used to ensure that the clubs are packaged and shipped properly. When completing the checkout process the golfer will be charged $220.00 for drivers and $120.00 for all other demo products. HOWEVER, upon return receipt of the clubs at our facility, golfers will immediately be refunded $200.00 for drivers or $100.00 for all other clubs.


The Sub 70 639 MB Plus was designed by the club makers at Sub 70 in response to a consistent question they got during their many years of building clubs and fitting golfers: am I good enough to play a blade? For anyone who has asked themselves that question and been afraid to invest in a club they may not be skilled enough to hit consistently, the MB Plus is your answer.

Like its brother the 639 MB, the MB Plus is a classic looking iron that is precision forged and CNC milled from a single billet of DT-4 super soft steel, which provides the same buttery feel and responsiveness that players look for in a blade. From there, the top line was nominally widened, the offset deepened, and the heel to toe length of the blade made slightly longer. These three changes were specifically tested until the club had the largest possible sweet spot while also allowing workability and providing feel and feedback to the player. The iron is finished in a handsome and utilitarian brushed satin to reduce glare, and the muscle back provides ideal launch parameters and maximum energy transfer for distance. Perhaps most importantly, the larger blade size, deeper offset, and slightly wider topline all have the combined effect of instilling confidence at address, allowing a player that once asked the question, to now have an answer.

Head Number 3 4 5 6 7 8 9 PW
Loft 20 22 25 28 32 36 41 46
Lie 59.5 60 60.5 61 61.5 62 62.5 63
Offset 4.8 4.6 4.2 3.7 3.4 3.1 2.9 2.6
Bounce 1 2 2 5 5 5 5 7
Head Weight 242 249 256 263 270 277 284 292
Standard Length Steel 39 38.5 38 37.5 37 36.5 36 35.75
Standard Length Graphite 39.5 39 38.5 38 37.5 37 36.5 36.25
Material DT-4 Steel
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