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 snug wearing experience. 2. Compatible with the charging case; even larger sizes can be safely stored inside. 3. Ergonomic design conforms to the natural shape of the human ear canal. Body heat-activated material ensures comfort during extended wear without causing ear fatigue. 4. Designed based on real ear anatomy for a comfortable fit and effective sound isolation. 5. Nano-coated surface is soft and breathable, allowing for prolonged wear without discomfort. Fit for: WF 1000XM4, WF 1000XM3, Airdots 3 Pro Earbuds Due to different production batches, variations in product appearance and printed text may occur, which do not affect functionality. Color: Gray Material: Sponge Size: M Package Contents: 3 pairs * sponge earphone covers for in-ear headphones Only the above package content is included; other items are not part of this package. Note: Lighting effects and monitor settings may cause slight color differences between the image and the actual item. Measurement tolerance allowed is +/- 1-3 cm.