The main difference between the Classic Paddle and the Pro Series is the type of carbon fiber surface.
The Classic Paddle has a surface with t700 carbon fiber.
The Pro Series has a more durable 3K fully woven carbon fiber surface.
Additionally, the Pro Series comes in two difference widths - 13mm and 16mm. The 16mm is thicker and better for finesse and controlled hits. The 13mm is better for players seeking maximum power and pop in their game.