I have never used it. This is a set of 3. I received this as a gift. Similar products are here ▶▷▶#rin's_bulk_purchase I have many other items for sale too ☺︎ ▶▷▶ #rin's_shop ----------------------------- ✔ Instant purchase without comment is welcome✩*⋆ ✔ Midnight/early morning silent purchase OK! ✔ Bundle discount, repeat customer discount, and follow-up discount are available, so feel free to comment♡ ̖́- ✔ All items are free shipping ◎ Since this is a personal inspection, there may be errors in the description. The actual product images are correct (*ᵕ ᵕ)⁾⁾ Anonymous shipping is not available. ----------------------------- 56/32/33/34 29 Link Dream [2024 Model] Earplugs for Sleeping, Quiet Sleep, Noise Reduction Value 28dB, Doesn't Hurt Ears, Silicone, Set of 3 (S, M, L sizes), Relief for Hyperacusis, Noise Reduction, For Airplane, For Studying, Noise Reduction Measures, Soft, Washable, Noise Reduction (SNR): 28dB, with Storage Case (Black) 20006000