Saint Pro is the big brother to the Saint with added stability for the more experienced player. While more overstable, it maintains the good glide and controllable flight characteristics of the regular Saint.
About the Opto X plastic:
Opto is made out of some of the world’s most durable plastics. It comes in a variety of beautiful translucent colors. The Opto Line plastic has been developed to withstand severe punishment and extreme conditions better than other plastics. Opto-X is a slightly stiffer plastic that results in more overstable flights.