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Pirelli has issued more information about how the 2016 tire rules will work after the FIA World Motor Sport Council approved the new system on Wednesday.
Starting next year, there will be five compounds - with the purple-marked ultrasoft joining the range. Now, teams can choose three of the compounds for each race weekend, but within certain guidelines.
The teams' choices will be made to a deadline set by Pirelli - well before the tires are made and shipped to the venues - and those selections will only be made public two weeks before the race.
Intriguingly, drivers within teams can have different choices. It will be interesting to see how that will work, as some drivers are known to be kinder on tires than their teammates.
Pirelli explains the full rules as follows:
"In consultation with the FIA, Pirelli will decide in advance which three compounds can be used at each race, and communicate this information to the teams.
"The total number of sets that can be used during practice, qualifying and racing remains the same as it is currently: 13.
"Pirelli will nominate two mandatory race sets for each car. Furthermore, one set of the softer compound will have to be kept for use in Q3 only.
"The two mandatory sets chosen by Pirelli can be of two different compounds, from the three that have been nominated for the race weekend. These sets will obviously be identical for each team.
"The remaining 10 sets can be chosen by each team, from the three compounds nominated for the race weekend.
"The teams will make their choices within a deadline set by Pirelli. They will communicate their choices to the FIA, which will in turn tell Pirelli how many tires to produce. The choices for each car will remain secret until 2 weeks before the race. If a team does not meet the deadline, the choice will be made by the FIA.
"Once the choices for each car have been made, the FIA will continue to assign the tires randomly via a barcode, as is the case currently.
"The choices made by each team can vary for each of its cars: so each driver within a team can have a different allocation.
"The tires will be distinguished by different colored markings on the sidewalls, as is currently the case.
"Teams will still have to give back tires according to a certain schedule, but they can decide which tires to give back at the following times:
"One set after the first 40 minutes of FP1
"One set at the end of FP1
"Two sets at the end of FP2
"Two sets at the end of FP3
"The two mandatory sets nominated by Pirelli cannot be given back during practice and must be available for use in the race. At least one of these two sets must be used during the race - but the teams can decide which one.
"The top 10 at the end of qualifying will still have to give back the set of the softer compound nominated for Q3, and start the race on the tires with which they set their fastest time in Q2 (the same rule as is the case currently). All other drivers will be able to use the set that is saved for Q3 during the race."
