Thank you for viewing! I am selling this item to declutter. [Overview] Alexander Horn #103 B♭ 1st Valve Slide (Straight Tube), Yellow Brass, Unlacquered Finish [From the Seller] Using this 1st valve slide makes the sound tighter (more focused), and compared to the original P-shaped tube, the sound becomes more vibrant. In particular, the landing rate of high D and E♭ has improved, and the sound resonates more. (I think it's easier to find the sweet spot for high notes) Removing the spit valve on the 2nd valve slide has become easier. There is a feeling of use, so please be aware of that. I would appreciate your consideration! Thank you very much!