neutral [SEP] i bought this product to use on my daughters hair she is her hair is super thick and cannot seem to decide whether it wants to be straight or curlypros takes forever to heat up they say seconds up in the description but like a full minutes to reach it is display is celsius i had to do some math to figure out what to set it on call me a dumb american or whatever but every other hair tool i own is fahrenheityou have to provide some real tension in the hair to get both the roots and the ends straight this may work better with a glove when you get to the ends to hold them there but i did not have one handy and had to go over the ends several timesso i would pretty well recommend this for someone my daughters age where she is going to be safe using it on her own i do not think i would use it on my own hair unless for some reason i found myself without my other styling tools it is a good way for her to learn how to take care of her hair though