Big Banger Alu Power 1.25mm Super polyester available in Smooth or Rough version in Silver colour, soft polyester used by Roger Federer and other professional tour players, for control, comfort and durability. One of the most popular polyester string on tour. 38ft set for £14.00 Smooth or Rough. 720ft reel, Smooth or Rough for £225.00. Made in Belgium.