From the Super Mario Wiki
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The Ring Burner is a robotic enemy first appearing in Super Mario 3D World. They appear in only three levels: Cakewalk Flip, Rainbow Run, and Champion's Road. When the player ventures near one of these enemies, they blast either square or circular plasma rings outward from their center. They have the same insignia commonly found on Bill Blasters. Also, they act and look similar to Sentry Beams from Super Mario Galaxy and Super Mario Galaxy 2. As with mobile Sentry Beams, Ring Burners only become disabled as long as the player stands on one. They cannot be destroyed by any means.