Who Makes The Tires Used in F1 Races?

The inner liner of a tire is with butyl rubber and butyl rubber that has been halogenated. While F1 tires are made up of 90% synthetic rubber and 10% natural rubber, typical passenger car tires are constructed of a mixture of 55% synthetic and 45% natural rubber.
However, the exact chemical breakdown of F1 tires is unknown because manufacturers protect their tire formulas.