Digital Audio Directions: Invigorate your Sennheiser HD-600 with Dekoni Audio Ear Pads
Sennheiser HD 600/565/580/650 Ear Pads – Thomann Elláda
Amazon.com: Geekria Fabric Headband Pad Compatible with Sennheiser HD600, HD580, HD650, HD660 S Headphone Replacement Headband/Headband Cushion/Replacement Pad Repair Parts (Black) : Electronics
PSA: If you ever thought: "Do I already need to swap the pads on the HD 600? Yes. Yes you do. : r/headphones