Pirelli has revealed its tyre compound selection for the Russian Grand Prix which hosts the fourth round of this season's Formula 1 championship.

New for 2016, teams will be able to choose between three compounds for a race weekend in an effort to give it more flexibility over strategies. Of the 13 seats being made available over the course of a race weekend, Pirelli will choose two for the race, one of which must be used during the race.

As part of the changes, Pirelli is announcing its tyre compound selections nine weeks before all European rounds, which extends to 15 weeks for an overseas GP.

Pirelli has selected the same three compounds it also chose for the opening three rounds Bahrain, China and Australia. The Russian race weekend at Sochi is to be held from the 29 April to the 1 May, two weeks after the Chinese Grand Prix.

-P Zero White medium
-P Zero Yellow soft
-P Zero Red supersoft

Each driver must have both these sets available for the race and must use at least one of them.

These are the tyres that Pirelli has said must be used at some point in the race:

-One set of P Zero White medium
-One set of P Zero Yellow soft.

In addition to the new tyre regulations for 2016 drivers will save a set of the softest of the three nominated compounds (supersoft) for Q3, and the drivers who make Q3 must give these tyres back to Pirelli after being used while the remaining drivers will keep these tyres for the race.