Item Type: Ear TipsMaterial: Silicone + Memory FoamInner Hole: Approx. 4.5mm / 0.18inApplication: Suitable for earbud type headphones with a sound guide hole of about 4.5mm-6.0mm / 0.18in-0.24inPackage List6 x Ear TipsManual measurement, please allow some errors.1Universal Hybrid Earplugs: The advanced hybrid 2 layer design, composed of external silicone skin and internal memory foam, will perfectly shape earplugs suitable for the ear canal. 2Easy To Clean and Sound Isolation: Combines the easy to clean advantages of silicone and the excellent sound insulation advantages of memory foam, while maintaining the comfort of earplugs. 3Enhanced Sound Performance: The replacement eartips design provides tight sealing and improved sound insulation, resulting in better bass response and improved sound performance. 4Separable Design: The biggest advantage of the ear tips is that the silicone and memory foam can be separated. If you don't want the memory foam, you can take it out or use the silicone sleeve alone. 5Application: With a standard 4.5mm wide opening, compatible with over 98% of the earphones on the market. Suitable for inner hole from 4.5mm6.0mm earbud type headphones. Ideal for any damaged, scratched, defective or lost ones, give a new life to your earphones.