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CN-1 Boston Concert Series E-1 string for classic guitar CN-2 Boston Concert Series B-2 string for classic guitar CN-3 Boston Concert Series G-3 string for classic guitar CN-4-NT Boston Concert Series D-4 string for classic guitar CN-5-NT Boston Concert Series A-5 string for classic guitar CN-6-NT Boston Concert Series E-6 string for classic guitar CN-4-HT Boston Concert Series D-4 string for classic guitar CN-5-HT Boston Concert Series A-5 string for classic guitar CN-6-HT Boston Concert Series E-6 string for classic guitar CN-2-BK Boston Concert Series B-2 string for classic guitar