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Amazon.com: 3.5mm Stereo to Mono Adapter, 2 Pack 3.5mm 1/8" TRS Stereo Male Plug to 3.5mm 1/8" Mono Female Jack : Electronics
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Amazon.com: Monoprice 107129 3.5mm Stereo Plug to 3.5mm Mono Jack Adaptor, Gold Plated : Electronics
Amazon.com: Switchcraft 11 Mono Female 1/4-Inch Jack with Nut and Washer, Nickel Finish : Musical Instruments
Amazon.com: DISINO 1/4" Mono to 1/8" Stereo Adapter, New Upgrade Gold-Plated 6.35mm TS Male Jack to 3.5mm TRS Female Stereo Adapter for Headphone, Amp Adapte, Black - 1 Pack : Electronics