SRD:Greater Bracers of Archery
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Bracers of Archery, Greater: These wristbands look like normal protective wear. The bracers empower the wearer to use any bow (not including crossbows) as if she were proficient in its use. If she already has proficiency with any type of bow, she gains a +2 competence bonus on attack rolls and a +1 competence bonus on damage rolls whenever using that type of bow. Both bracers must be worn for the magic to be effective.