One 'n Only Brazilian TECH straightening irons blend liquid keratin with titanium, infusing this powerful combination into the plates of the irons to reinforce keratin's natural strengthening, smoothing, and shine-enhancing properties. These professional styling tools are recommended for use with keratin straightening treatment and to enhance everyday styling. Optimum temperatures and consistent high heat up to 450° ensure keratin is absorbed and sealed into the hair for longer-lasting, shiny, straight results. Keratin/Titanium Fusion Plates. Ceramic Heater: Instant Heat and Recovery. 40 Heat Settings - up to 450°F.