Amazon.com: 6pcs (B-NSTB) Left + Right Side Stabilizers Fins Wing Eartips Adapters Compatible with Sennheiser (M2 IE) Momentum I and G, HD1, HD1 Free and IE, CX, CXC, CXL, OCX, MM Series
Sennheiser Momentum True Wireless 2 vs. Momentum True Wireless | Digital Trends
Amazon.com: Sennheiser HD1 In-Ear Wireless Headphones, Bluetooth 4.1 with Qualcomm Apt-X and AAC, NFC one touch pairing, 10 hour battery life, 1.5 hour fast USB charging, multi-connection to 2 devices : Electronics