Hoopty

"The ruby inside of Hoopty always stays perfectly in the center, by some unknown force that holds it there."

earth miscrits

 halo

"Halo's rings can separate for each other, but it really doesn't like when people try to use it for a hula hoop- that's just rude."

 lynk

"Lynk is a favorite companion among Miscrian magicians, because its ringed body can perform endless tricks."

 shackle

"Shackle, despite its name, is not currently nor has it ever been used to hold Miscrian prisoners at bay."