1. Durable Material: Yoyo strings are made of cotton rope material and are durable in use. 2. Feature: Yoyo replacement strings have a flexible design and can adapt to various yoyo models and sizes. 3. Yoyo String Length: Each yoyo string is 100 cm/39.37 inches long. Before playing yoyo, you can adjust the yoyo string length for your playing. 4. Easy to Install: They are easy to install and replace, allowing children to operate by themselves. 5. Application: They are suitable replacement strings for responsive and unresponsive yoyo. 6. Specification: - Material: Cotton Rope - Size Chart: - Length: 100cm/39.37inch 7. Package Includes: - Optional Package: 12 or 10 Yoyo Strings 8. Note: - Please allow slight errors due to manual measurement and different monitors.