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Castor Improved Bass Earbuds with Microphone (Tuning)\u003c\/h3\u003e\n\u003cp id=\"b\"\u003eChallenging all flagship products in the Hi-Fi industry with its formidable\nstrength\u003c\/p\u003e \n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n \u003cul class=\"a\"\u003e\n \u003cli\u003eKZ Castor breaks through traditional acoustic tuning methods by innovatively adopting a dual-dynamic driver acoustic design. 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