Mouthpiece Shank Repair Kit - Full w/o Instrument Repair Hammer Mouthpiece Shank Repair Tool is made of 303 Stainless Steel with a redesigned smaller tip to repair the smallest French Horn and the occasional "fold over" 9 Mouthpiece Repair Sleeves - Lg Bore Tuba, Sm Bore Tuba, Bass Trombone, Tenor Trombone, Trumpet, Euphonium, Flugel, Cornet, French Horn Mouthpiece Repair Sleeves are precision machined in brass to fit your mouthpiece taper while not allowing the shank to protrude completely through Fix your mouthpiece shank quickly and professionally, sleeves will not allow the shank to become flared or oblong. Reccomended for use with our Instrument Repair Hammer