Pirelli has opted for a step softer at two tracks - Azerbaijan and Brazil - while there are two new circuits in the Netherlands and Saudi Arabia.
Pirelli F1 boss Mario Isola said: "Announcing all the selections for the year right now will help the teams and the drivers with their planning, also allowing for maximum flexibility just in case the calendar has to change due to Covid-19 restrictions, as we saw last year.
"The selections themselves are on the whole similar to last year [or 2019, in the case of races not run in 2020], which means that teams should have plenty of data to fall back on.
"But we have two races where the nominations are softer. The first is Azerbaijan, where our C2 hard tyre wasn't used last time, so we are now going with the softest selection of all: C3, C4 and C5.
"Then we have Brazil, where we will take the C2, C3 and C4 this year, as the C1 that was selected as the hardest choice last time didn't show a particularly big advantage in terms of wear over the medium.
"In both cases, the softer nomination could lead to a greater variety of race strategies".
Pirelli and the FIA reserve the right to alter the selection up to 15 days before each race should circumstances require it.
GPFans is a multi-platform, multi-language brand dedicated to Formula One coverage. We bring you all the ins and outs of the sport, 24/7, everything from up-to-the-minute news and features to the latest viral stories and clips.
We believe that a new generation of exciting, outspoken drivers will make F1 more popular than ever before, and we want to give our users access to as much of their heroes as possible, on and off the track. From Lewis Hamilton to Max Verstappen, Daniel Ricciardo to Sebastian Vettel, we provide in-depth analysis of every every Grand Prix in the season, from Australia to Abu Dhabi.
With Formula One under the new ownership of Liberty Media, how the sport is being covered is evolving, and GPFans will look to be at the heart of this progression into new media, as one of the fastest-growing sites covering the king of motorsports.