name of this belt? pics

whats the name of this belt, and is it hard to replace and how long , cause i think mines is gonna snap soon. its the thinnest of the 3 belts.alright thanks

p/s belt noob:P

you’ll need a 12mm wrench, 12mm socket, 3" socket extension, ratchet, 10mm socket, 6" extension

loosen the two 12mm nuts holding it down, then you have to back out the belt tensioner with the 10mm