Formula 1 tyre provider Pirelli says it received "positive" feedback from drivers and teams for the prototype tyres it introduced during Friday's practice sessions for the Brazilian Grand Prix.
Teams were given two sets of the tyres which will be used in next year's season.
"The initial feedback we received has been very positive," Pirelli motorsport director Paul Hembery said. "With testing opportunities so limited in Formula 1, we wanted to give teams the opportunity to try out our tyres before the first official test in February next year, so that they can start to understand how the new tyres interact with the current cars."
Drivers used the new tyres during most of the morning session and in part of the second, with Lewis Hamilton complaining of overheating at times, while Sauber's Sergio Perez -- who will be replacing the British driver at McLaren in 2013 -- said the new sets had more mid-corner grip.
"The tyre that the teams tried today has a different structure with a faster warm-up," he said. "This delivers extra performance within a wider working range, due to increased cornering grip, which is exactly what we were aiming for."