Violin Bow Corrector Collimator Straighten Tool Posture Effect Positive Device for Beginner 4/4 3/4 Violin Accessory Transparent color

The bow straightener is used to correct the wrong player bow posture of the beginner.

And the specification requires the beginner to maintain the correct bowing posture.

Thus develop a good bowing habit. It is more convenient for beginners to practice piano.