According to Solinco, "A newly developed, ultra-performance co-polyester string designed and shaped to generate maximum spin and bite potential, while providing for superior all-around playability."
$5.75 Shipping with $75 Purchase.
$5.75 on qualifying products* when you make a purchase of $75 or more. When shopping you can identify products by red $5.75 shipping box on product page of items that ship for $5.75.
* All string, grip, clothing, table top stringing machines and accessory orders.
** Contiguous US only.
*** Court equipment, Professional Stringing Machines and Tennis Balls are excluded.