What kind of strings John Myung uses?

[King Roundwound]

Do anyone know?

This video is the main reason why I'm asking this.

I know that John has all kind of equipment in order to create that sound, but I believe that those strings are the main reason why that bass have that incredible sound.

[anyonefortennis]

He's listed on the d'addario site as an endorsing artist but I'm not sure if the ones on that clip are from before or after the endorsement.