Discraft classifies these as 'Advanced Skill Level' discs and recommends them for players with lots of experience, power and speed. They are extremely overstable. The Stability Ratings range from 1.8 to 2.5.
See Discraft's Disc At a Glance Chart | Discraft's Flight Guide | Disc Selection Advice | Discraft Plastics | Stability Ratings
(Each link opens in a new Tab and can stay open for reference while you shop.)