Reach:
Reach indicates how far a disc can fly, ranging from 0 to 10. The higher the reach, the greater the distance the disc can travel. A higher reach provides extra distance, while a lower reach is better for shorter, more controlled throws.
Drift:
Drift describes how the disc moves during flight. On a scale from +5 to -5, +5 means the disc is overstable and turns slightly left, while -5 means the disc is understable and turns right. This affects how the disc reacts to wind and the curve of the throw.
You may sometimes find these numbers on the disc, otherwise you can always scan the QR code to access the disc's profile page where all the information, including this, is available.