POYATU FC300 Headphone Ear Pads For Onkyo ES CTI300 ES FC300 ES CTI300 ES FC300 Headphone Earpads Cusions Repair Parts Black|Earphone Accessories| - AliExpress
ONKYO ES-FC300 headphones – review and mod: replacing the disastrous MMCX connectors with 2.5 jacks
Best Buy: Onkyo On-Ear Headphones Black/Red ESFC300R