Is this used on dry hair? Yesssss definitely. Make sure to wash your hair well, dry it and apply some heat protectant serum for safe use. What is the highest temperature? 450 degrees Fahrenheit in only 45 seconds as it heats up really fast. Can I use it on kids? Yes but make sure it does not touch their scalp. And in general, try to avoid any heat on your kids hair just not to damage your hair at a young age. -What is the material of the barrels? It is Tourmaline-infused ceramic barrels for 5 different looks. The ceramic tourmaline helps create shiny and glossy curls. What is the material of the barrels? It is Tourmaline-infused ceramic barrels for 5 different looks. The ceramic tourmaline helps create shiny and glossy curls.