Official Yamamoto acoustic. Studio: Yamamoto acoustic. M2.6: bolt length 6, 8, 12, 15, 18, 20, 25mm present each 2. 6mm bolt: 0.36g / 1 piece. 8mm bolt: 0.41g / 1 piece. 12mm bolt: 0.53g / 1 piece. 15mm bolt: 0.63g / 1 piece.
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