Geekria Protein Leather Headband Pad Compatible with Sennheiser RS160, RS170, RS220, RS185 Headphone Replacement Headband/Headband Cushion/Replacement Pad Repair Parts (Black): Amazon.co.uk: Electronics & Photo
HDR180 Digital Wireless Headphone System (RS170/180) User Manual RS170_US Sennheiser Electronic (NY)