MeloAudio 2 PCs Headphone Adapter 6.35mm (1/4 inch) Male to 3.5mm (1/8 inch) Female Stereo Audio Jack Adapter for Guitar
https://www.vogueparade.com/shopping/EN/100005481/1/1005003255226863/meloaudio-2-pcs-headphone-adapter-635mm-14-inch-male-to-35mm-18-inch-female-stereo-audio-jack-adapter-for-guitar//