1. The noise reduction and sound insulation earplugs are made of elastic material, which provides a comfortable fit, increases the adhesion between the ear canal, and achieves a stable and fitting wearing experience. 2. It does not affect the charging cover box, even large size can be safely placed in the charging box. 3. Ergonomic design adopts ergonomic design, which conforms to the shape of the human ear canal. It is comfortable to wear and can be activated by body heat. It is comfortable to wear and does not swell the ears. 4. The real machine mold is comfortable to wear and fit the ear canal to isolate the sound. 5. The nano coating is soft and breathable, and the material is not painful to wear for a long time. Fit for:WF 1000XM4 WF 1000XM3 airdots 3ProEarbuds Due to different batches,there may be differences in product appearance and printed text,which will not affect use Colour:Black/Gray Material:sponge Size:S/M/L Package Contents: 3 pairs * sponge earphone covers for in-ear headphones Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.