Amazon.com: Gvoears HD600 Earpads for Sennheiser HD650/HD600/HD660S/HD545/HD525/HD535 Headphones, Ear Cushion Replacement Also fit for Massdrop X HD6XX/HD58X and HD580/HD565 Jubilee Headphones(Velour) : Electronics
Dekoni Elite Velour replacement earpads for the Sennheiser HD6XX Series