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 Jawbreaker Plastic
Jawbreaker plastic was developed to be the finest plastic blend available for putt and approach discs. Super tacky - give 'em a squeak! Unique jawbreaker marbling. Advanced polymers provide good durability. Discs have a medium stiffness.