Steel construction for durability and long lasting performance This straight collimator for violin bow is built from steel, providing exceptional strength and reliability for regular instrument practice. Dual track design with easy installation Features a two stage dual track design with convenient double sockets. The steel rod slides smoothly into the corresponding sockets, while grooved plastic card stickers give a stable and convenient installation. Enhances practice for beginners Specifically developed for violin bow practice, this collimator is an effective accessory that helps beginners focus on rhythm and intonation, contributing to an overall improvement in technique. How it works The steel rod is inserted into the dual sockets of the collimator, and the grooved plastic card stickers secure the setup for stable use during practice sessions. Use scenarios - Home practice: use during daily bowing warmups to promote straight, controlled bow movements. - Lessons or studio work: helps students maintain proper bow alignment while working on rhythm and intonation. - Teacher demonstrations: provides a clear reference for correct bow control and technique during demonstrations.