If you want to wear them as a style, you may better with the skinny green and blue ones bc its a smaller curl closer to a perm rod or flexi rod set. If you would like to use them to stretch your hair for other styles, get the lon and wide, wear it for a day or two, then proceed to the next style. PS Not sure if you know, but there is a generic version of curlformers on ebay and they are a fraction of the cost. They come from china or somewhere overseas though, so it takes a few weeks to get them.