Red Bull and McLaren have taken the most aggressive approach to tyre choices for this year's race in Belgium, with both opting to take nine sets of Pirelli's purple-marked ultra-soft compound.
Mercedes in contrast are among the most conservative, taking six sets of the ultrasoft - a choice echoed by Force India and Haas. Ferrari are in the middle, electing for seven sets of the ultrasoft.
Despite the punishing demands of the Spa-Francorchamps circuit, Pirelli have opted for their three softest compounds - the soft, supersoft and ultrasoft tyre.
Several teams have taken aggressive approaches as a result. Daniel Ricciardo and Max Verstappen for example will only have one set of soft tyres to use for the entire weekend - as will Felipe Massa and Lance Stroll at Williams, and Stoffel Vandoorne at McLaren.
Lewis Hamilton has four sets of softs to choose from - the joint-most of any driver - while his team mate Valtteri Bottas has three - as do Ferrari duo Sebastian Vettel and Kimi Raikkonen.