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Amazon.co.jp: QDC-SUPERIOR-BK Superior Piano Black Earbuds with 0.4 inch (10 mm) Single Full Range Dynamic Driver, Coaxial Dual Magnetic Circuit & Dual Cavity Structure, Uses IEM2pin Connectors, High Resolution, : Electronics,

Amazon.co.jp: QDC-SUPERIOR-BK Superior Piano Black Earbuds with 0.4 inch (10 mm) Single Full Range Dynamic Driver, Coaxial Dual Magnetic Circuit & Dual Cavity Structure, Uses IEM2pin Connectors, High Resolution, : Electronics,

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