Amazon.co.jp: Beyerdynamic DT 990 Pro Open Over-ear 250 Ohm Stereo Headphones (Black/Gray) : Electronics
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Amazon.co.jp: beyerdynamic Dt 990 Pro Over Ear Studio Monitor Headphones - Open Back Stereo Construction, Wired 80 Ohm, Black (Limited Edition) : Electronics
Amazon.co.jp: beyerdynamic DT 990 PRO Over-Ear Studio Monitor Headphones - Open Back Stereo Construction Wired (80 Ohm, Grey) : Electronics