Chromeling

Appearance
Chromeling shells are as shiny as mirrors and almost indestructible. They are colored dark grey, and often hide in their shells, only peeking their heads out like turtles. [1]

Personality
Chromelings are quick-witted and perky. They don’t hang out with just anybody; they’re shiny little snobs. This is why the Chromelings are friends with Beau. He is the only horse they have found beautiful enough, and snobbish enough, to associate with! [2]