Enhance and secure the fit of your Sennheiser Earphones with the Sennheiser Double Flange Tips. Many of our customers are extremely happy with the improved security of the Double Flange Tips. Fits the Sennheiser IE 4/5/6/7 in-ear earphone models and all Sennheiser CX series earphones. Please choose your preferred size. NOTE: Eartips are NOT returnable if the pack is opened due to hygiene/health concerns.