25ft 3.5mm (1/8 inch) TRS Stereo Male to 2 x 1/4" (6.3mm) TS Mono Male Cable - PI Manufacturing
5m 3.5mm Stereo Jack to 2 x 6.3mm Mono Jacks Audio Cable Lead 5055383419067 | eBay
3.5mm to 6.3mm Jack Adapter Mono – KOMA Elektronik
C2G 3.5mm Stereo Male To 6.3mm Mono Female Adapter 40635 B&H
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Mono Guitar Bass Cable 3.5mm Male to 6.3mm Male plug Music Instrument Cable 3 Meter Black|Guitar Parts & Accessories| - AliExpress
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Sendt 1/8 inch (3.5mm) Male Stereo to Dual 1/4 inch (6.3mm) Male Mono Instrument Cables with two XLR male adapters