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 snug wearing experience. Designed to be compatible with the charging case, even larger sizes can be safely stored inside without interference. Ergonomically shaped to match the natural contour of the human ear canal, these earplugs offer a comfortable fit and are activated by body heat for improved softness and comfort, reducing ear fatigue during extended use. Precisely molded to fit the ear canal comfortably, helping to block external noise effectively. Featuring a soft and breathable nano-coating, the material ensures long-term wearing comfort without causing discomfort or pain. Compatible with: 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.