Item Type: Bow Straightener_x000D_ Material: ABS+Metal_x000D_ Colour: Black_x000D_ Suitable for 4/4 violin. 1The convenient fixing strap of this violin bow straightener is easy to install and remove. 2With this bow straightener, it can help you develop correct bow posture and wrist movements when practicing with the bow. 3This violin bow straightness corrector is small in size and light in weight, making it easy for you to put it in your performance bag. 4Suitable for beginners to master the correct bowstring movements and violinists to improve their performance. 5Using the bow straightener can force you to find a sense of equilibrium and verticality in the running track of the bow straightener. When practicing open strings, scales, etudes, and music, the bow will be very stable.1 xViolin Bow Straightener