Driver: GT2 & GT4. Fairway Wood: GT2. Weight Options:3g(-6), 5g(-4), 7g(-2), 9g(std), 11g(+2), 13g(+4), 15g(+6), 17g(+8), 19g(+10), 21g(+12), 23g(+14). It can add extra weight to golf club. Enables you to change the weight of golf club to fit various needs.
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