Hybrid. 100% braided Kevlar fibers bonded with nylon mains. 17 and 18 gauge are Crossfire not Crossfire II.
$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, and accessory orders.
** Contiguous US only.
*** Court equipment, Professional Stringing Machines and Tennis Balls are excluded.