@Effie54 Can't say about the perm she uses. I know she currently uses Tressa Zone Control, but she has used other perms in the past since I've been getting them for years and a few years ago the one she used required sitting under a dryer. This one doesn't. She uses fairly large perm rods on me, the largest ones are orange and the next largest are a more peachy sand color. I know they can vary by brand, looking at rod size charts, the ones that most closely correspond to the rods used are the 11/16 and 12/16-inch sizes. she uses a few other sizes in the mix too I think, but I didn't really pay that much attention to that.
Regardless, I've never had any perm fall out, even the bad one I got decades ago during the Farrah years when I wished it had. Who knows what they used on me back then. They all do loosen up a bit after the first month though.
My hairdresser sometimes refers to my perms as a body wave. I'm just happy not to have to spend the time styling it especially since I'm home most of the time, but even so I want my hair to look nice.