As explained by Pirelli, the session will be "entirely given over to validating" the tyre range's softest compounds for next year: the C4, C5 and C6 compounds.
So, in addition to the usual dry tyre allocation for the grand prix weekend, drivers will be given two more sets of tyres. One will be a test control tyre - i.e. the same compound as the soft in the normal allocation - and the other will be a 2025 prototype, which Pirelli has confirmed was homologated in September.
https://www.motorsport.com/f1/news/why-mexican-gp-second-practice-is-different-to-the-rest-of-the-f1-season/10666341/
同一篇文 兩段嘅意思都好似唔同, 唔係好睇得明