As agreed with the FIA, F1 tyre supplier Pirelli will conduct 25 days of in-season testing  this year to help with the development of its future products and compounds.

Only Mercedes, Ferrari and Red Bull were called upon for testing in 2016 as they were the only teams which had the resources to help with the Italian manufacturer's development work.

But this season, all teams have signed for various assigned dates spread across six circuits, Bahrain, Barcelona, Paul Ricard, Silverstone, Magny-Cours and Interlagos.

Teams will be allowed run 2017-spec cars obviously but with no updated parts, while each outfit must submit to the FIA in advance the chassis number, the power unit and its electronic settings as well the car's bodywork configuration.

GALLERY: All the pictures from Friday in Bahrain

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Phillip van Osten

Motor racing was a backdrop from the outset in Phillip van Osten's life. Born in Southern California, Phillip grew up with the sights and sounds of fast cars thanks to his father, Dick van Osten, an editor and writer for Auto Speed and Sport and Motor Trend. Phillip's passion for racing grew even more when his family moved to Europe and he became acquainted with the extraordinary world of Grand Prix racing. He was an early contributor to the monthly French F1i Magazine, often providing a historic or business perspective on Formula 1's affairs. In 2012, he co-authored along with fellow journalist Pierre Van Vliet the English-language adaptation of a limited edition book devoted to the great Belgian driver Jacky Ickx. He also authored "The American Legacy in Formula 1", a book which recounts the trials and tribulations of American drivers in Grand Prix racing. Phillip is also a commentator for Belgian broadcaster Be.TV for the US Indycar series.

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