The Bach HS2525 component trombone handslide 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 perfect custom trombone for your playing needs. The HS2525 handslide features a 0.525-inch bore, with a standard weight yellow brass outer slide and chrome plated nickel silver inner slide. This handslide also features a yellow brass crook and three threaded leadpipes – 47, 42, and 42O (open) to allow players more playing options to fit their individual playing needs.