No Harm To The Strings: Erhu Fine Tuner are easy to install and can be used for fine tuning the erhu. The design is reasonable and the buckle is tight, which will not scratch the strings at all, and will not affect the vibration of the strings and the pronunciation effect. Erhu Violin Fine Tuner: Polished surface, stable intonation, sensitive tuning. The card is stable on the strings without shaking, and the fixation is stronger. Remember to stagger the two fine tuner to avoid collisions. Material: Erhu Violin Tuning Hardware Tools are made of high quality metal material, which is durable. It will not rust after long time use. Wide Application: Tune Adjuster is suitable for Erhu, Gaohu, Zhonghu and other huqin types. It is easy to use, professional and very practical Packing List: a single String Tune Adjuster size 1.9cmx1.5cm/0.75inchx0.59inch. Compact size, light weight, easy to carry. You will receive 2 Erhu Fine Tuner. Package Includes: 2Erhu Fine Tuner Note: Please allow slightly errors due to manual measurement and different monitors.