Discraft says this about the Putt'r:
Discraft Stability Rating: X-Line 0.0; Z-Line 0.0
The Putt'r? is an excellent turnover approach putter. It goes super straight, and feels great in your hand. The Putt'r? has been referred to by some as the best putter ever!
This disc has been discontinued in Z-Line and Z-Line Fly Dye.... (more)