I really don't know I never used them they were given to me. They are small. Like about 1/8th their like in a sprial they have cut ends on top and bottom kind of like a key ring I tried to open it up but I couldn't with my finger nails maybe with some jewelery tool they will. I don't know too much about these. I will post another picture I'm not sure if it will come out to well. Hope that helps.
Thank you, they sound like split rings and the smaller they are the harder to open. I have a tool I use to open them. One more question, if you line them up next to a ruler, how many of them does it take to make approx 1 inch.