19mm is a small electric curling iron, which is generally used for curling bangs, and it can also be used for styling wheat ears. And if you like retro micro-roll style, then the small electric curling iron will suit you very well.
MM with harder hair is more suitable for 25mm medium-sized electric curling irons. The curling effect is good and the holding time is longer.
This kind of larger diameter electric curling iron will make it easier to curl up your hair. It is very suitable for curling pear heads and big wavy curls. It will make you exude charming charm and make you more eye-catching.
For thin and easily curled hair, it is suitable for 160 degrees. Normal and perm-dyed damaged hair is suitable for 180 degrees. Thick or natural curly hair is suitable for 200 degrees. For damaged hair, it is recommended to use a lower temperature.
If you want to make the ends of your hair less rigid and add a little curl, you can adjust the temperature to 160 degrees. If you want to make the curls more visible, or create a more retro look, set the temperature to 180 degrees and let the hair stay on the curling iron for a few seconds.