Pirelli boss Paul Hembery has revealed the Italian tyre-maker made 'useful' progress this week in Bahrain while trying out a 'number of solutions' with F1 2015 in mind.

A total of eight new constructions and six new compounds were tested during the two days at the Sakhir Circuit, split between Caterham on Tuesday then Mercedes and Williams on Wednesday.

"Only one variable was tested at a time, so if a new compound was being tested, then the construction would be the current one (and vice versa). The teams alternated prototype runs with baseline runs on the existing tyres, for comparison purposes," Pirelli explained.

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The 250 experimental tyres brought to Bahrain, distinguished by being free from any colour stripes on the sidewall, were 'exclusively' designed with 2015 in mind.

Over the course of the two days, Pirelli completed a total of 110 laps and around 595 kilometres with its experimental tyres, in ambient and track temperatures that were a lot hotter than those experienced during last weekend's race, the third round in the 2014 F1 World Championship.

"The opportunity to test with the current cars is something that we have always wished for and it was vital to have this written into the regulations this year. We made useful progress throughout both days of the prototype tyre test, trying out a number of solutions with 2015 in mind, in demanding conditions," Hembery confirmed.

"Having accumulated this valuable data over two days, we will now analyse it carefully to assess the best development direction for the next in-season test in Barcelona, where we expect to see further evolutions in car performance."

The Barcelona F1 in-season test at the Circuit de Catalunya will take place after next month's Spanish Grand Prix, running from May 13-14.