NONDK 1 PCS Violin Bow Collimator Exercise Straighter Adjuster 3/4 4/4 Violin Bow Straight Bow Corrector Black

This product is a violin bow straightener, made of high- quality steel wire material, and easy to use. It is used to correct the wrong playing posture, so as to develop a good bowing habit for beginners. It adopts double- section and double- track design, which is more stable and convenient. Self bowing practice guide, it can help you develop correct bowing and wrist movements. The simple way to practise straight bowing! It is more convenient to practice for beginners. Fine workmanship. and portable.