Bubbly Coral

Bubbly Coral are strange, mysterious devices that look like coral, but have the ability to produce bubbles that have similar strength to the bubbles that Yarukiman Mangrove produce.

Usage
Not much is known about the use or effect of the Bubbly Coral. It is shown that pressing the tip of the coral will produce a bubble at the other end of the coral. The coral is used by merfolk and fishmen to stand on. It is shown to be very useful to the merfolk in particular, giving them ability to "stand" or navigate outside of water. It can also be used by creatures who cannot breathe or travel underwater, to produce an air bubble to allow them do so.

Trivia

 * Bubbly Coral is similar to the Milky Dials in its effect, with one storing and releasing solid clouds and the other producing really strong bubbles.
 * They are in different sizes, as the handheld ones are used while Nami was seen using a giant one to drain the water out of Ryugu Palace in the anime.