Features 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 WF‑1000XM3 WF‑1000XM4, 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 3.8mm‑5.8mm sound holes. Suitable for Sony and other general brand silicone sleeves. Specification Item Type: Silicone Earplugs Material: Silicone 4 Sizes: L M S XS Inner Diameter: Approx. 3.8mm/0.15in Outer Diameter: L: Approx. 13mm/0.51in M: Approx. 12mm/0.47in S: Approx. 11mm/ 0.43in XS: Approx. 10.6mm/0.42in Scope 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 Earplugs