Havran
The first flight performance number indicates how quickly the disc is able to cut its way through the air, aka how aerodynamic it is. The slowest drives are number 1 and the fastest are number 14.
The name itself suggests that it will be about how long the disc stays in the air. The minimum is 1 (falls to the ground like a rock) and the maximum is 7 (he has time to go to lunch before he hits the ground).
Now it gets interesting. When you throw the disc (RHBH), it initially flies quite fast and tends to turn to the right. The numbers take on values from -5 (a lot to the right) to +1 (not flying to the right at all). Discs with a negative turn are also more suitable for beginners.
The opposite of the turn. This time, however, it is a low speed (at the end of the flight) - because of it, the disk turns to the left (RHBH). Values from 0 (flight ends straight) to 5 (extremely left). Discs with a high fade are suitable, for example, for headwinds.