These are cork seals. As the name suggests, they are made of a cork-like material. These are from over 10 years ago when I used to exchange seals✨ It seems I used a few, and the seals in the photo are unused. Since it's been over 10 years, the adhesive strength may have weakened. Please understand that these are used items before purchasing. When shipping, I will package them as they are in the photo, wrapped in bubble wrap♪ Instant purchase ⭕️ Same-day shipping ⭕️ Thank you for viewing!