The Square-X is easily in our Top 3 best selling co-polys for its softness and incredible feel. Most players we know who played with rpm have switched to the Square-X not only because of the price but it’s playability and durability. If you want a very soft co-poly which is easy on the arm; incredible feel and durable but less than half the cost of rpm...then switch to this gem!
This is a square shapes string with Two Flat surfaces, mains/crosses, in contact with each other give extra durability, no notching and the string returns very quickly from any movement after hitting the ball.
It measures 1.20mm across the flat sides and therefore plays like a much thinner string increasing power and control. We have only one word to describe this string: Unique!
NOTE: The black color plays softer than the white.