Cyclone is a unique ten-sided co-polymer string. The string shape enhances spin and control while offering good durability. Available in a wide variety of gauges and colors, Cyclone is one of the most versatile strings on the market.*A set of tennis string contains a 40 foot continuous string, enough to string one racquet. A reel of tennis string has 600ft (200m) of string, enough to string a racquet 16 to 18 times.