Description: 【Wide Compatibility】Suitable for trombone, French horn, and alto horn with rotary valve systems, meeting common repair and replacement needs for various brass instruments 【Component】Serves as the essential center shaft in the rotary valve system, ensuring smooth key and rotation for enhanced playing sensitivity 【Options】Available in left or right center shaft specifications, designed to fit different instrument structures and installation directions 【Material】Crafted from high strength zinc alloy, offering nice wear resistance, anti deformation properties, and corrosions protection for long term frequent use 【Fit】Manufactured with accurate diameter and length dimensions, providing a secure installation that minimizes wobble and unwanted noise Specification: Material: Zinc Alloy   Size Chart:1.9cmx0.4cmx1.15cm/0.75inchx0.16inchx0.45inch Package Includes: 1 Trombone Rotor Valve Note: Please allow slightly errors 1-2cm differences due to manual measurement.