I use memory wire to make these, which is slightly more expensive than earring hoop wires, which is what a lot of people use. However, I love the memory wire because you don't have to fiddle with claps at the back, it just pops right on and off the wine glass.
I also made two other sets. Here is a set of wine markers for quilters:
Look how cute this tiny sewing machine charm is!!
I'm out of the charms to make the tool markers and the quilting markers, so once they're gone, they're gone until I restock. I only made one set of the knitting wine markers, but I have the supplies to make more, so if they sell out, feel free to shoot me an email and I can make more for you. I can make crochet wine charms as well.