Feature:1. WIDE COMPATIBILITY: The earplug tips feature a standard 4.0mm wide opening and are compatible with most headphones on the market. Suitable for use with 4.0mm/0.15in‑5.7mm/0.22in wireless headphones or other wired headphones with internal holes.2. UNIQUE DESIGN: The earbuds earplug have a built in recess that does not interfere with the Bluetooth charging compartment, making these earbuds more suitable for Bluetooth headphones than normal.3. ERGONOMIC DESIGN: Earplug replacements are comfortable to wear without sound fluctuations due to squeezing and deformation of the ear canal. The ergonomic design is not easily fatigued by long‑term wear.4. PERFECT REPLACEMENT: Replacement earplugs are suitable for any damaged, scratched, defective or missing earplugs, giving them a new lease of life.5. DIFFERENT SIZES: 1 pair each of small and large sizes, 3 sizes, 1 pair of earplugs for each size. The different sizes allow you to find the best fit for your earplugs.Specification:Item Type: Earplug TipsMaterial: Memory FoamColour: BlackApplicable: For Headphones with 4.0mm-5.7mm Sound HoleMemory Foam Middle Silicone Tube Aperture: Approx. 4.0mm/0.15inThree Sizes: Large, Medium and SmallLarge Size:Outer Diameter: Approx. 11.2mm/0.44inHeight: Approx. 7.0mm/0.28inInside Diameter: Approx. 4.0mm/0.15inMedium Size:Outer Diameter: Approx 10.8mm/0.43inHeight: Approx. 7.0mm/0.28inInside Diameter: Approx. 4.0mm/0.15inSmall Size:Outer Diameter: Approx. 10mm/0.39inHeight: Approx. 7.0mm/0.28inInside Diameter: Approx. 4.0mm/0.15in Package List:6 xEarplug Tips Note:Manual measurement please allow some errors.