1、Compact And Lightweight: This violin bow straighten collimator is small in size and light in weight, which makes it convenient for you to put it into your violin case, gig bag, and it is very easy to use. 2、Excellent Plastic Material: This violin fiddle straighten collimator is made of excellent plastic material, which is sturdy and abrasion resistant, not easy to be damaged, and has a long service life. 3、Good Compatibility: This violin bow corrector is a good fit for 4/4‑1/2 violins, which is perfect for beginners to master the correct bowing action and for violinists to improve their playing skills. 4、Multifunctional: This violin bow straighten corrector tool is multifunctional and is a self taught bow practice guide to help you develop proper bow and wrist action to make your playing easier. 5、Bilateral Covering Design: This guide fiddle bow collimator adopts left and right side covering design, the bottom wisp is not acoustically pronounced and does not change the original sound quality.