Home Dealnews Certified Refurb Sennheiser HD 660S Open-Back Headphones for $350 + free shipping Dealnews Certified Refurb Sennheiser HD 660S Open-Back Headphones for $350 + free shipping By ARCOM - 7 June 2021 67 0 SHARE Facebook Twitter Go to the deal page: Certified Refurb Sennheiser HD 660S Open-Back Headphones for $350 + free shipping