Feature:1. Good Performance: Eartips provide greater sound insulation, stability and lasting comfort, are durable, flexible, interchangeable and removable.2. Excellent Listening Experience: Ear tips deliver deep, consistent, rich bass. Robust, no sound fluctuations due to ear canal compression and deformation.3. Ergonomic Design: Replacement eartips are ergonomically designed to be less fatiguing and comfortable to wear over long periods of time, and can be replaced with any damaged or missing eartips.4. Compatible: Replacement eartips are available for the WF1000XM3 WF1000XM4 and are also compatible for beatsX, for Senso and most other earbuds.5. 3.8mm/0.1in Opening: Replacement ear tips have a 3.8 mm wide opening. Compatible with headphones using 3.8mm5.8mm/0.10.2in sound holes.Specification:Item Type: EartipsMaterial: SiliconeScope of Application: Suitable for earphone guide hole for 3.8mm(0.1in)-5.8mm(0.2in) or so in ear headphones3 Sizes: L, M, SInside Diameter: Approx. 3.8 mm/0.1inOuter Diameter:L: Approx. 13 mm/0.51inM: Approx. 12 mm/0.47inS: Approx. 11 mm/0.43in.Package List:12 x EartipsNote:Please allow for some errors in manual measurement