BRAND NEW ReString Zero Tennis String 17 Gauge 1.23 mm 2 PACK Our flagship co-poly - designed to deliver maximum bite, unparalleled snapback and longer lasting playability. For players looking to grip the ball aggressively and beat their opponents with power and spin. Built to last and packaged responsibly in a paper sleeve. Zero is a six-shaped co-poly string designed to deliver maximum bite on powerful strokes. Comfortably firm, players with long strokes will enjoy the string's spin potential for a great grip on the ball. Compared with traditional co-polys, Zero maintains superior string tension for a longer-lasting lively feel.