The Babolat Pro Hurricane Tour 1.3mm string set is a octagon shape that provides more bite on the ball and thus allows more spin. The Pro Hurricane is also now known as RPM Hurricane. String sets strings one racquet. Worth pointing out that if you frequently break your strings, the Babolat Pro Hurricane Tour has excellent durabitlity. Since it’s a firm string, this probably suits more intermediate to advanced players (baseliners) who have long, fast strokes. The coating allows the strings to snap back with great force so that you get a heavy ball with lots of spin to bring it back down. This is a monofilament string. Colour is yellow.