I decided to save time and use a stapler to attach each chip back-to-back so that the definition and word would be on color versus the white backing of the chips. I'm sure you could use double sided tape or glue to make it look more flush and clean but for the sake of time- I just stapled them.
I had the plastic rings lying around from a few years ago- I think they were $3-$4 at a teacher store but you could use metal rings, a twist tie, etc. to attach them together. Since I teach math this is a great way for students to practice their math vocabulary words for each unit. You could even have them put math facts on them.