George Russell brought the first of two days of 18-inch Formula 1 tyre testing to a close in Abu Dhabi on Sunday.
The 18-inch compounds will be used in the sport from 2021 onwards, following their introduction to Formula 2 next year.
The new tyres will be brought to F1 as part of a wide range of technical and sporting changes in 2021, all aimed at closing up the competition.
F1 will continue to race with 13-inch tyres in 2020.
Bahrain International Circuit - Winter testing