http://f1pressarea.pirelli.com/wp-content/files/pdf/38696.pdf

Milan, December 11, 2017 – Pirelli is bringing the following compounds to the Australian Grand Prix (Melbourne, March 23-25), Bahrain Grand Prix (Sakhir, April 6-8), and Chinese Grand Prix (Shanghai, April 13-15).

A reminder of the rules: Each driver must save one set of the softest of the three nominated compounds for Q3. This set will then be returned for those who qualify in the top 10, but the remaining drivers will keep it for the race. Each driver must have both these sets available for the race. Teams are free to choose the remaining 10 sets, making 13 sets in total for the weekend.