If you love the Tourna Cross system, but your tool is empty, there’s no need to buy a whole new Tourna Cross system. Simply refill with these handy strips that minimize string friction, increase sweetspot and extend the life of your strings. Tourna Cross works by fitting in between strings and preventing rubbing that results in string breakage. Increases sweetspot. Increased roughness for better control and ball spin. Will not negatively impact playability. Used by pros on tour.35 durable plastic crosses on each strip. Easy to install with the Tourna Cross tool. Tourna Cross tool NOT included.