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http://www.headphone.com/headphones/kef-m200-hi-fi-in-ear-headphones.php The KEF M200 employs twin dynamic drivers at the heart of its design providing impressive bass extension complimented by a smooth mid and high frequency range. Aluminum construction gives the M200 a stylish modern look and robust feel while providing a tuned chamber for the low frequency driver component to produce tight, resonance free bass tone.