This hair clips are made of heavy duty plastic and a high elastic metal spring making it light weight, sturdy and durable enough to handle any type or length of hair. These clips won’t slip and the grip is very tight, great to curl or style hair when need clips to hold up while styling, straightening, blow drying, and coloring, cutting, working out or bathing. Clip's string allows them to automatically adjust to hold any type, thickness or amount of hair.