Hamilton has worn specially designed one-off helmets for several weekends throughout his career. At the 2010 Monaco Grand Prix, Hamilton sported an altered helmet design with the addition of a roulette wheel image on the top. At the 2015 Malaysian Grand Prix, Hamilton brought with him a striking blue-and-green design – in honour of team sponsor, Petronas – but was prevented from using the helmet by the FIA. Hamilton has sported gold coloured helmets three times in his career. After winning his fourth title in 2017, Hamilton entered 2017 Abu Dhabi Grand Prix in a gold helmet with four stars adorning the top of the helmet with the words "World Champion". Hamilton wore a gold helmet at the 2018 Abu Dhabi Grand Prix after sealing his fifth world title, toward which he made reference with five stars on either side of the design,