I love these buttons! I use them as clasps a lot with the wrap-style bracelets, though they'd be great for their actual intended use ;)
They are glass buttons with a built-in glass back as shown.
They have a lovely swirl textured pattern.
They are made with a vintage mold, but they are modern.
The color is Crystal Clear with a silver foil backing.
They are 18mm in size.
You will receive 2 buttons total.