Discraft says this about the Zone: Discraft Stability Rating: D-Line 2.0; ESP 2.0
The Zone is an overstable low profile, small diameter putt and approach disc. For players who like an overstable putter for hyzer arch putts and short drives. Very predictable as an approach disc as well.
About D-Line Plastic
Superior grip, great for beginners or pros, very economical, different amounts of wear yield desirable flight differences.