The Bach TS47Y component trombone main tuning slide is designed to fit any of the Bach Artisan Stradivarius curated modular trombones, or it can be combined with your choice of other modular components to create the ideal custom trombone for your playing needs. The TS47Y main tuning slide features a reverse tuning construction with a yellow brass crook. The Bach Stradivarius Artisan line brings together the best classic design elements from the world-famous Bach Stradivarius trombones coupled with an expansive option of Artisan modular components, allowing you to customize your instrument for the sound you want.