The Bach V47I Infinity component trombone valve section 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 V47I valve section features the patented Infinity axial flow valve with top and bottom bearings. The bearing design allows for smooth, balanced action, low maintenance and no surface wear with superior compression. The mini-ball linkage allows for free, responsive movement.