Discraft says this about the Crank SS: Discraft Stability Rating: Z 0.7
Just because you don't have a lot of power, doesn't mean you don't deserve more distance! Crank SS was designed to deliver significantly more distance for low-power throwers. You'll find it to be very fast and controllable, with a comfortable grip.
About Z-Line Plastic
Most durable, truer flights, last 2-3 times longer.