Fine & Thin Hair? These might not work for you! [SEP] My wife bought these hoping to use them with her hair. Even the smallest one really didn't work for her hair. She has pretty fine and thin hair (When you pull her hair into a pony tail the pony tail base is no larger than a nickel) and she really didn't have enough hair for this to work for her. The length of your hair has no effect, so it's all about quantity/thickness.