noun
glass marble; marble stopper in a ramune bottle
Specifically the glass marble that seals a bottle of ramune (Japanese lemon soda). Also used for the marble itself as a toy or collectible.
See also: ラムネ
ラムネ玉を押して飲み口を開ける。
Push the glass marble to open the drinking spout.
子供の頃、ラムネ玉を集めていた。
When I was a child, I used to collect ramune marbles.