Specification: Item Type: Ear Tips Material: Silicone Inner Diameter: Approx. 4.5mm/0.17in Outer Diameter: L: Approx. 14mm/0.55in, M: Approx. 12.5mm/0.49in, S: Approx. 11mm/0.43in Scope of Application: Suitable for Earbuds Earphones with Sound Guide Holes of About 4.5-6.5mm/0.17in-0.25in 3 Sizes: L, M, S Package List:12 x Ear Tips Note:Manual measurement, please allow some errors. High Quality Material: Soft silicone ear tips provide higher noise isolation, stability and long lasting comfort, durable, flexible, replaceable and removable. Good Sound Quality: Eartips deliver deep, stable, rich bass. Sturdy and durable, it will not cause sound fluctuations due to ear canal squeezing and deformation. Ergonomic Design: Earplugs are ergonomically designed, comfortable to wear for a long time, not easy to fatigue, and can be replaced with any damaged, scratched, defective ones. Compatible: Replacement earbud tips work for Jaybird X4 X3 X2 X earbuds earphones, and are compatible with most other earphones. Contains 3 sizes to meet the needs of different people. Application: These eartips have a 4.5mm wide opening. Compatible with earphones using 4.5mm to 6.5mm sound holes. Universal silicone ear tips that fit most headphones. High Quality Material: Soft silicone ear tips provide higher noise isolation, stability and long lasting comfort, durable, flexible, replaceable and removable. Good Sound Quality: Eartips deliver deep, stable, rich bass. Sturdy and durable, it will not cause sound fluctuations due to ear canal squeezing and deformation. Ergonomic Design: Earplugs are ergonomically designed, comfortable to wear for a long time, not easy to fatigue, and can be replaced with any damaged, scratched, defective ones. Compatible: Replacement earbud tips work for Jaybird X4 X3 X2 X earbuds earphones, and are compatible with most other earphones. Contains 3 sizes to meet the needs of different people. Application: These eartips have a 4.5mm wide opening. Compatible with earphones using 4.5mm to 6.5mm sound holes. Universal silicone ear tips that fit most headphones.