Feature:1. High Quality Material: The replacement earplug head made of soft silicone material can provide more noise isolation, stability and lasting comfort, durable, flexible, replaceable and detachable.2. Good Sound Quality: Can bring deep, steady, rich bass. It is comfortable to wear, strong, and will not cause sound fluctuations due to the squeezing and deformation of the ear canal.3. Ergonomic Design: Using ergonomic design, long term wearing is not easy to fatigue, wearing comfort is once again upgraded, and it can replace any damaged, scratched, defective or missing earplugs.4. Multi Purpose: The earplugs are suitable for Sony WF1000XM3 WF1000XM4, can be put into the charging case, and are also compatible with for beatsX, for Sony, for Senso and most other earplugs.5. Compatible: These earbuds are compatible with over 98% of headphones. With a 3.4mm wide opening. Compatible with headphones that use 3.8mm5.8mm sound holes. Suitable for Sony and other general brand silicone sleeves.Specification:Item Type: Silicone EarplugsMaterial: Silicone4 Sizes: L M S XSInner Diameter: Approx. 3.8mm/0.15inOuter Diameter: L: Approx. 13mm/0.51inM: Approx. 12mm/0.47inS: Approx. 11mm/ 0.43inXS: Approx. 10.6mm/0.42inScope of Application: the Inner Tube Diameter of This Product is 3.4mm/0.13in, Which is Suitable for Headphones with a Sound Guide Hole of About 3.8mm-5.8mm/0.15-0.23in..Package List:8 x EarplugsNote:Please allow 0.1‑0.2cm/0.04‑0.08in error for manual measurement