I recently ordered some natural cork stoppers. These are natural cork stoppers punched from cork oak. Apparently, thermosetting adhesives are used in the commonly available compressed cork, and I don't want to use those for my small parakeets... I'm offering 50 pieces this time. As shown in the photo, the sizes are random. (80 yen per piece) x 50 pieces + 210 yen (for Nekopos shipping) = 4,210 yen. * If you leave a comment with the number you want, I'll create a dedicated listing for you. If you let me know what kind of pet bird you have, it would be helpful in deciding what to include as a bonus, and I'd appreciate it! (#^.^#)