1. The noise reduction and sound insulation earplugs are made of elastic material, providing a comfortable fit and improving adhesion within the ear canal for a secure and stable wearing experience. 2. Designed to be compatible with the charging case; even the larger size can be safely stored inside. 3. Ergonomic design conforms to the natural shape of the human ear canal. Body-heat activated material molds comfortably to the ear, offering a soft fit without causing ear fatigue. 4. Precisely molded to match the original earphone shape for a natural fit, enhancing comfort and sound isolation. 5. Nano-coated surface is soft and breathable, allowing for extended wear without discomfort. Fit for: WF-1000XM4, WF-1000XM3, Airdots 3 Pro Earbuds Note: Due to different production batches, there may be slight variations in product appearance and printed text, which do not affect functionality. Color: Black Material: Sponge Size: M Package Contents: 3 pairs * sponge earphone covers for in-ear headphones Note: Light reflection and differences in display screens may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 1-3 cm.