Steel construction for durability and lasting performance. Dual track design: two-stage dual track with double sockets. This arc corrector allows you to insert the steel rod into the corresponding jack according to your needs. Groove plastic card stickers provide stable and convenient installation. Improves beginner practice: an effective accessory for learning instruments. It helps beginners focus on rhythm and intonation, improving the overall learning experience. Specially designed for bow pliers: specially cut for bow pliers, this corrector provides the necessary support and guidance for optimal performance during practice sessions. Use scenarios: - Use during beginner bowing practice (scales and patterns) to guide the arc and improve rhythm and intonation. - In regular practice, quick and stable installation with the dual track design helps maintain a consistent arc. - When working with bow pliers, the specialized cut offers proper fit and supports technique development.