It's a 43/425 Over front.

Here's a quick urban meyer breakdown:
https://247sports.com/college/penn-state/Article/Penn-State-vs-Michigan-football-game-Urban-Meyer-on-Nittany-Lions-defense-Micah-Parsons-Yetur-Gross-Matos-137055572/

Very aggressive with the blitz. One of the heavier blitzers in the country:
https://theathletic.com/2860455/2021/10/01/inside-penn-states-defensive-changes-brent-pry-gets-aggressive-plus-red-zone-success-and-linebacker-shuffling/

Currently the 8th best defense in the country (adjusted for SOS):
https://www.footballoutsiders.com/stats/ncaa/fei/overall/2021

11th in yards per play:
http://www.cfbstats.com/2021/leader/national/team/defense/split01/category10/sort02.html

5th in passing YPA
http://www.cfbstats.com/2021/leader/national/team/defense/split01/category02/sort04.html

Interestingly, they have some of the lowest sack numbers in the country:
http://www.cfbstats.com/2021/leader/national/team/offense/split01/category20/sort03.html

This indicates that the pressure is more controlled pressure to speed a QB up and be disciplined rather than an all out "get there at all costs" mentality.
[Post edited by GoHornets at 11/30/2021 11:09AM]