Violin Teaching Training Assistant Tool Standard Bracket for Correcting Violin Bow Playing Posture for 3/4 4/4 Violins

Features: Violin playing assistant tool for correcting posture of pulling violin bow. ABS material, durable and lightweight. Convenient usage and easy installation. Suitable for 3/4, 4/4 violins. A great assistant tool for violin beginners. Discounted at only: US$ 9.99