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Medium Tyres, or mediums, are identified by their yellow sidewalls and are one of three compounds available for each race. The other two are Soft and Hard. 

The teams receive 3 sets of Medium tyres for the weekend and must change to a different compound at least once during the race. 

F1 Tyres are supplied by Pirelli and they have five standard compounds to select from labelled C1 (hardest) to C5 (softest).

Andrew Burden

The author Kiwi F1 Fan