The clothes pins on these are PERFECT for hanging up paper on, because they are smooth and protected by plastic, also they are already mounted on the hanger itself, so it's ready to go. =)
I am sure there are equivalents in other countries.
Since everything in my darkroom is purchased on a severe budget, I use clothespins that I buy in packs of 200 or so for a couple of dollars. I bought two packs at once, and haven't had to buy a third pack yet. I hang 35mm by one at the top, and hang a second on the bottom...120 has two and two. I'm sure that nice stainless steel clips would be great, but when I process film I do it in large batches and I might have twenty or thirty rolls hanging up overnight...that's up to 120 clips in use at once.
if your dentist has converted to digital x-rays, he may have dental fillm clips laying around. There is nothing as good. They make a pin-prick sized hole in the corner and hold 7x17 film very securely.
[FONT=Comic Sans MS]Films NOT Dead - Just getting fixed![/FONT]
I'm using these all-plastic clothes clips found in our local Walmart. I use them for prints and film (roll/sheet). They won't rust, or soak up water. You can mark on them with ink identifiers as required. Very inexpensive and functional.