I have the 2 sizes. I got them from the warehouse. I have long hair below my shoulders that is fine but lots of it.
I find it works best for me when I don't straighten my hair as the wave helps keep them in place. You put your hair in a ponytail, thread the ring over, wrap the hair around and pin into place. I also like to use a hair tie, once the pony tail is up, thread it over and get the hair tie and place it over and it pulls the hair in tight and leaves all the ends out all messy.
I do a lot of hair ups and rockabilly styles and this ring is a staple in my hair kit. So easy to use anyone can do it. And it makes your hair look super professional. Make a ponytail, tie it up, slip ring over ponytail and ta tah done. The thing I really like is 2 sizes available I use the largeest one because even though my hair is only shoulder length it is super thick I found the smaller ring didnt quite hold in place. I highly suggest this is a staple in all hair kits.
Tips: Holds best if your hair is a wee bit dirty or I use sea salt spray on my ponytail just before I slip the ring on for extra grip