1/48 scale masks for painting markings on aircraft

Hi fellow modelers. When I went to IPMS Nationals this year there were some guys selling masks so that you could paint markings on aircraft, instead of using decals. I’ve been googling this and can’t find any manufacturers. Who makes good masks?

There are several companies I can think of off the top of my head that I’ve seen: Eduard, Montex and Maketar. I see them all over eBay.

Some folks have made their own with a vinyl cutter like Cricut. I have a machine and am going to try it myself.