The Tecnifibre Black Code string is a flexible & pliable string that allows the ball to dwell on the strings for longer & create extra spin & control. This unique string is made from third generation polyester with a pentagonal cross-section & a co-polyester core for ultimate durability, making this string a fantastic, functional & hard wearing string for all your needs.A 200m reel will typically restring 18-20 rackets & can offer a saving of 20-50% compared to buying single sets.