Dekoni Audio · Aftermarket replacement
Dekoni replacement earpads for Sennheiser HD600 / HD650 / HD6XX / HD58X / HD660S and more (material variants)
Verified as compatible with 1 headphone model.
Verified compatible headphones
Evidence
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dekoniaudio.com
Dekoni’s product page explicitly lists the HD660S as a fit and offers multiple material variants, including sheepskin, fenestrated sheepskin, hybrid, Elite Velour, Choice Leather, Choice Suede, and velour.