Who Can Help Me?

My six year old daughter has to have glasses. We are picking them up this evening. Since insurance only covers one pair every two years, I really do not want them broken. She has to wear them all day except when sleeping of course. So I want to make her a special gemstone chain to wear with them mostly for playtime so if she gets hit or something maybe they won't fly off completely and break. Anyway I need to know what the little funny looking plastic things are called that attach to the end of the chain and then to the bow of the glasses. They are kind of shaped like a figure eight. I can't look them up to buy some, because I have no idea what they are called. If anyone knows the technical name for these little things I would love for you to share it with me. Thanks!