Soft fabric crown, sparkly blue 'jewel', bendable wire support, and velcro closure.
You can bend the wire in the front of the crown to fit your head. Total length of the crown around is 27 inches, and can be adjusted to fit any princess' head.
(green jewel Slime Princess crown available too, just ask!)
I do not own Adventure Time at all and am not affiliated with cartoon network in any way.