Velour Replacement Ear Pads for Sennheiser HD600 Series Headphones. The Sennheiser HD600 series of headphones are the standard in open back headphones. Dekoni’s pads are a little deeper than the stock pads opening up the sound stage, and the slow rebound memory foam helps alleviate clamp force from any user, even when wearing glasses. Dekoni Audio spent a lot of time designing and refining velour ear pad to be the most comfortable and best sounding velour pad available today. By using a tighter velour, Dekoni made the ear pad react more like traditional leather so that you don’t lose the bass frequencies or isolation seen in most velour pads, all while retaining the comfort and coolness of velour.