Violin Bow Collimator Alignment Rod - Material and build: made from high quality steel wire for durability and user friendly handling. - Easy way to practice straight bow technique: provides a simple and effective method to help you develop a straight bow. - Corrects wrong playing posture: designed to fix improper playing habits and help beginners establish good bowing discipline. its two piece and dual track design offers stability and comfort during training. - Silent teacher for bowing: acts as a quiet guide that reminds you to maintain the correct bow hold, helping you improve technique and form over time. - Compatible with common violin sizes: suitable for violins sized 4/4, 3/4 and 1/2. an essential tool for violinists and musicians looking to improve playing ability. - Practical use scenarios: ideal for daily practice to build correct bowing habits; useful in lessons with students to reinforce proper form; helpful for self guided practice sessions focusing on bow alignment and control.