Pirelli has announced that this years Spanish Grand Prix will be the first to use their “Incredibly Hard” compound.

After four races the teams are slowly getting used to the high degradation on the Pirelli rubber, but the “Incredibly Hard” compound has thrown a curveball because early reports say its made of a mixture of rubber, concrete and crushed up bits of Metallica singer James Hetfield making it one of the heavier tyres in existence.

Add this to the softer rubber in the option compound means keeping a balance over a whole race weekend is going to be trickier than ever.

It’s also rumoured that at Monaco Pirelli will be using Monster Truck tyres.