Fine Red

What is the best hair straightner fine red hair?
What is the best hair straightner to keep straight hair that is not straightning one hot iron. My hair is red and fine side. Do not want a lot of damage.
and basically the only way to keep your straight hair is straightened with a ceramic plate or get chemically straightened, but tends to be very expensive! My hair is very thick, so using a plate $ 25.00 Revlon ceramic i put half of my hair and the other half i striaght and let down because my hair is thick Soo whole thing was not well straightne