1. 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. 2. Designed to be compatible with the charging case, even larger sizes can be safely stored inside without interference. 3. Ergonomic design conforms to the natural shape of the human ear canal. The material molds comfortably to the ear with body heat, ensuring long-term comfort without causing ear fatigue. 4. Precision-molded to fit the ear canal comfortably and effectively block ambient noise. 5. Nano-coated surface is soft and breathable, allowing extended wear without discomfort. Compatible with: WF-1000XM4, WF-1000XM3, Airdots 3 Pro Earbuds Note: Product appearance and printed text may vary slightly between batches, but this does not affect functionality. Color: Black Material: Sponge Size: M Package Contents: 3 pairs sponge earphone covers for in-ear headphones Please note: Only the items listed above are included. Note: Lighting and display differences may cause slight variations in color. Measurement error allowance: 1-3 cm.