Watch these experts do synchronized Slinky manipulation

https://youtu.be/geChnHLITKo?t=57

These two guys have a tight routine manipulating black light Slinkies in unison. Hit the CC button for English subtitles.

Of course, the undisputed master remains this guy:

Image: YouTube / 우와한 비디오 X SBS 세상에 이런일이