The noise reduction and sound insulation earplugs are made of elastic material, providing a comfortable fit and enhancing the seal within the ear canal for a secure and comfortable wearing experience. Designed to be compatible with the charging case; even the larger size can be safely stored inside. Ergonomic design conforms to the natural shape of the human ear canal. Body-heat activated material molds comfortably to the ear, ensuring long-term comfort without causing ear fatigue. Precisely molded to fit the ear canal comfortably, helping to block external noise effectively. Nano-coated surface offers a soft, breathable feel, and the material is gentle on the ears, suitable for extended wear. Compatible with: WF-1000XM4, WF-1000XM3, Airdots 3 Pro Earbuds. Note: Product appearance and printed text may vary slightly between batches, which does not affect functionality. Color: Black. Material: Sponge. Size: M. Package Contents: 3 pairs × sponge earphone covers for in-ear headphones. The package includes only the items listed above; other accessories are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement tolerance: ±1–3 cm.