https://needlerunner.com/suppliers.asp Pretty sure there's only one Needle Runner, I've found the new ones "easy click" will fit any tube as long as its a one piece tube stem with no joints...They fit disposables no probs and click on the needle bars real easy...I actually use them on every machine I run, except the Neos, once they are on the bar lube them up a bit with some Vaseline or whatever lube your using to tattoo with and they work like a dream...