Thank you for viewing! I am listing this on behalf of my family, who used to do marching band. I have taken care of it as much as possible, but as you can see in the photos, there is some rust, scratches, and the SCHILKE 52 is deformed, so please be aware of this beforehand. It is unclear whether they are for large or small shank, but each is: ... KING SBEU: Base 14.8mm, Tip 12.9mm (Photo 3) SCHILKE 52: Base 14.4mm, Tip 12.8mm (Photo 8) ... so I hope this helps. Please feel free to ask about price reductions, etc. ^_^ #Euphonium #Mouthpiece #KINGSBEU #SCHILKE52