Testing underway @SilverstoneUK with @HaasF1Team @RGrosjean, @redbullracing @Sebastien_buemi, @WilliamsRacing #Kubica. Today we’re testing slick tyre prototypes in preparation for 2019. Slightly cooler conditions than the race weekend. pic.twitter.com/HXLad3W7jC

— Pirelli Motorsport (@pirellisport) July 10, 2018