Airfrex Bluetooth Adapter Receiver with 2.5mm Jack for Sennheiser Momentum 2.0 ON Ear and Over Ear Headphones, Sennheiser Momentum 2.0 Headphone Cable Cord Replacement Connector Converter
Sennheiser Ear Adapter black blue - CX series - - Ear adapter black blue (5 pairs) different sizes available
Sennheiser OP - CX black - - Ear adapter black for CX 300 S, CX 3.00, CX 5.00, CX 6.00 BT, CX 7.00 BT, CX SPORT, MOMENTUM In-Ear, MOMENTUM InEar Wireless, MOMENTUM Free