FiiO SK-M21C Cassette-Style Protective Case for M21 Color:Blue What is the purpose of

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FiiO SK-M21C Cassette-Style Protective Case for M21 Color:Blue What is the purpose ofSK M21C Cassette Style Case for M21 Two colors available Retro cassette shape Contact linkage Magnetic opening and closing Inner padding Start your retro musical journey with the M21 A retro cassette style case custom made for the M21, with precisely cut openings and a perfect fit. The case are made of specially selected high toughness and polycarbonate materials, high transparency giving it a pure, attractive look while making it light and portable.