Amazon.com: 6pcs - (M) Medium Replacement Set Earbuds Eartips Compatible with Sennheiser IE Series, CX Series, CXC Series, CXL Series, OCX Series, and MM Series in Ear Earphone Headsets : Electronics
Amazon.com: Sennheiser MX 680 Sports Earbud Headphone with Volume control & Earfin Clips (Discontinued by Manufacturer) : Electronics