1.Targeted Acoustic Optimization: Correct High-Frequency Timbre, Prevent Low-Frequency Leakage, Reduce Tooth Sounds, And Make The High-Frequency Listening Experience In Headphones More Rounded And Full. 2.Physical Soundproofing: Comfortable And Non Swelling Memory Sponge Ear Caps Activate The Receptor'S Thermoplastic Properties After Wearing, Expanding With The Shape Of The Ear Canal, Making Them More Suitable For Intense Movement And Less Prone To Detachment From The Ear Compared To Silicone. The Sealing And Soundproofing Effect Is Also Better. 3. High-Quality Memory Cotton Material: Memory Sponge Is A Polyurethane Foam With Slow Rebound Characteristics, Also Known As Slow Rebound Sponge Or Inert Sponge. After Compression Deformation, It Usually Takes 3-5 Minutes To Restore The Shape. So Even If It Undergo 4.Add coating: isolate external bacterial contamination, adsorb earwax, effectively reduce the risk of ear infections, improve sound quality, and bring a refreshing experience to your ears. 5.Wide Range Of Mainstream Size Compatibility: Suitable For Most In Ear Earphones With A Nozzle Diameter Of Approximately 45-55 Millimeters. Equipped With Three Sizes, Users Can Choose The Appropriate Ear Cap According To Their Own Ear Canal Size To Wear, In Order To Achieve A Good User Experience. Category:Earplug Active Noise-Cancellation:No Volume Control:No Style:In-ear Size:S:10x4x11mm M:10x4x12mm L:10x4x14mm Colour:black Material:sponge Package Contents: 2 x S earplug 2 x M earplug 2 x L earplug Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.