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Amazon.com: Sennheiser CX300-B Earbuds (Black) - Old Version (Discontinued by Manufacturer) : Electronics
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Original Sennheiser Cx300-ii Precision In-ear Only Headphones Deep Bass Earphones 3.5mm Wired Stereo Music Headset Sport Earbuds - Earphones & Headphones - AliExpress
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Sennheiser CX 300-II - Review | ThePhonograph.net
Sennheiser CX 300S - Earphones with mic - ear-bud - wired - 3.5 mm jack - noise isolating - red - Walmart.com