DAYAN Pro-poly string / Ten (10) Pack of 100% Polyester YoYo String
This is premium Type 6 100% Polyester yo-yo string Ultra bright! Works with all Yo-Yos. Yo-yo string should be changed periodically. Manufacturers generally recommend changing the string after about 30 minutes of play time, or if the string becomes frayed. Non-bearing yo-yos will wear out the string quicker.