The small ones are Aldi's quarter key rings to hold your cart quarter. The bigger ones are for chapstick/lighter holders have you quarter or chapstick or lighter handy. Lots of colors eh for leather n faux leather.
I haven't been around in a while had a couple heart attacks and an infection n kind of stepped back from Leatherworks a bit. But just starting back into it again. Here's a project.
another thing that can help is put a little 3 in 1 oil on the teeth to help it slide better. it don't matter how you build anything with a zipper it will have to be taken apart.