Review title is Can handle heavy hair, but tips and edges too sharp! [SEP] These are stand ins when I can't have metal in my hair for whatever reason. They flex more than I like, but they are plastic. I find the tips to be too sharp for comfort; I have to use caution when turning or pushing, so my buns aren't always as tight as needed for activity. Also, the teeth edges are sharp as well & cut my hair! I've had to sand down the edges, hence the 4 stars. More care toward finishing is needed. Recommend with reservations.