What do the numbers mean?
SPEED 1 TO 14
Speed is the rate at which a disc can travel through the air. Speed 14 Distance Drivers are the fastest, having the PDGA maximum legal wing width. Faster discs cut into the wind with less effort and are best when throwing up wind. Slower discs take more power to throw upwind, but they’re easier to throw more accurately and may actually go farther downwind. High speed discs are not recommended for beginners as they require more power to fly properly.
TURN +1 TO -5
High Speed Turn is the tendency of a disc to turn over or bank to the right (for RHBH throws) during the initial part of the flight. A disc with a +1 rating is most resistant to turning over, while a -5 rating will turn the most. Discs rated -3 to -5 make good roller discs. Discs with less turn are more accurate in the wind. Discs with more turn are easier to throw for beginners.