Introduced by parent company SRI Industries in 2010, the XXIO (pron. "ze-ku-shi-oh") MP600 irons are made from SUS630 stainless steel with a titanium face. A tungsten-nickel "power dumbbell weight" in the 4-9 irons for more weight in the toe and heel and higher MOI.
They are available in RH only, in 4-iron (22°) through 9-iron (39°), then PW (44°), AW (50°), and SW (56°).
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