Erhu Mechanical Tuning Pegs

This is an unused item that was found during a major cleaning. Below is an excerpt from the box's contents:
1. Same appearance as traditional wooden reels
2. Mechanism is made of titanium, making it lightweight and durable
3. The shaft will not come loose due to temperature, humidity, or air pressure
4. Features a locking mechanism for both forward and reverse rotation
5. Winding gear ratio is 10:1
National Patent Product

When installing, it may be necessary to widen the hole in the rod.