Bowser Stunner

Bowser Amps are a special type of Amps that first appear in New Super Mario Bros. U.

New Super Mario Bros. U
In New Super Mario Bros. U, Bowser Amps make their only appearance in Red-Hot Elevator Ride as obstacles, where they electrocute the player on contact. Unlike common Amps, Bowser Amps have special chains connected to another Bowser Amp, creating a stream of electricity to travel on the chains.