There is a string at the top in the loop and a micro ring already attached. All you have to do is to put your hair through the loop and pull at the string. It automatically pulls the hair through the micro ring. And then, just squeeze the ring . It is done.You may adjust the length as your hair grows : simply using the plier to open the micro ring and push the extension back up towards your scalp . and then reclamping the micro ring shut.If you want to remove the extension, all you have to do is to open micro ring and remove it.It won’t damage hair because it has no glue and chemicals.