Per SIT Strings website Max uses Power Steel Stainless Electric strings

Per S.I.T Strings website Nikki uses their strings and has a signature set as well.

Jason Becker used S.I.T. Brand Strings, opting for 10-46 gauge strings during his work with Cacophony and on his solo albums, and 9-42 gauge strings while playing with David Lee Roth. This information is supported by a user-uploaded photo.

According to the Guitar Geek rig diagram, Dean DeLeo uses S.I.T. Brand Strings in 10 and 11 gauge on his guitars.

She uses SIT strings because they never break unless you try really hartd to break them. She says this at 2:15

This post shows Jacky with SIT Strings in 9-42 and 10-52.

on his website he says that he uses sit strings

(from GuitarGeek) "A detailed gear diagram of Mike Schleibaum's Darkest Hour stage setup that traces the signal flow of the equipment in his 2009 guitar rig."

In a 2011 interview, he stated that "he uses SIT strings 'of all sorts'" and that "every single string I touch is SIT".

Yusuke Chiba uses S.I.T. Brand Strings, as confirmed by the equipment documentation available on 機材図鑑.

Yusuke uses custom sets of S.I.T. Power Wound nickel strings. The gauge from thinnest to thickest are: 11p-14-18-28pw-38-46-56. He tunes a half-step down with the G string flattened again. (E♭-B♭-F-D♭-A♭-E♭-B♭).

Danny Knapp is confirmed to use S.I.T. Brand Strings, as evidenced by his status as an official artist for S.I.T. Strings. On his official website, he states: "Danny uses S.I.T. Powerwound Nickel round-wound and Power Flats on his bass guitars."