I have decided to buy a Miraphone mouthpiece. I looked at their website and I am confused by all the measurements let me clarify. The site has many different mouthpieces and they differ from things like Cup depth, Bore, and Cup Ø. I have no idea what those mean. Can someone explain them.

The cup depth is how deep the cup or funnel of the mouthpiece is. The 'bore' is the size of the hole in the middle of the mouthpiece. Throat is the angle of the mohtpiece from the bottom of the cup to the bore. Backbore is the inside taper of the mouthpiece shank (from the bore to the end of the mouthpiece).

Cup
Cup depth
Bore
Cup Ø

Tuba
deep
36,4 mm (1,433 inch)
7,0 mm (0,276 inch)
29,5 mm (1,161 inch)

Tuba
very deep
42,7 mm (1,681 inch)
8,2 mm (0,323 inch)
31,0 mm (1,220 inch)

Tuba
shallow
40,0 mm (1,575 inch)
7,6 mm (0,299 inch)
31,5 mm (1,240 inch)

Tuba
deep
44,5 mm (1,752 inch)
8,2 mm (0,323 inch)
31,7 mm (1,248 inch)

Tuba Helleberg
medium
34,4 mm (1,354 inch)
7,0 mm (0,276 inch)
32,0 mm (1,260 inch)

Tuba Winston Morris
shallow
36,4 mm (1,433 inch)
7,5 mm (0,295 inch)
32,0 mm (1,260 inch)

Tuba
deep
37,9 mm (1,492 inch)
7,5 mm (0,295 inch)
31,5 mm (1,240 inch)

Tuba
deep
41,0 mm (1,614 inch)
8,0 mm (0,315 inch)
31,5 mm (1,240 inch)
silver plated

Tuba
deep
44,9 mm (1,768 inch)
8,2 mm (0,323 inch)
32,0 mm (1,260 inch)

Tuba
deep
41,1 mm (1,618 inch)
8,0 mm (0,315 inch)
32,1 mm (1,264 inch)

Tuba
deep
36,9 mm (1,453 inch)
7,5 mm (0,295 inch)
32,5 mm (1,280 inch)

Tuba Rose Orchestra
very deep
45,7 mm (1,799 inch)
8,2 mm (0,323 inch)
32,7 mm (1,287 inch)

Tuba
deep
41,0 mm (1,614 inch)
8,2 mm (0,323 inch)
32,9 mm (1,295 inch)

Tuba Rose Solo
shallow
37,9 mm (1,492 inch)
8,2 mm (0,323 inch)
33,0 mm (1,299 inch)

Tuba
very deep
44,1 mm (1,736 inch)
8,2 mm (0,323 inch)
33,0 mm (1,299 inch)

Tuba Helleberg
deep
42,3 mm (1,665 inch)
8,3 mm (0,327 inch)
33,0 mm (1,299 inch)

Tuba
very deep
44,9 mm (1,768 inch)
8,4 mm (0,331 inch)
33,5 mm (1,319 inch)

Tuba Theinert Solo
very deep
45,8 mm (1,803 inch)
8,6 mm (0,339 inch)
32,0 mm (1,260 inch)

Tuba Theinert Orchestra
very deep
45,0 mm (1,772 inch)
9,0 mm (0,354 inch)
33,0 mm (1,299 inch)

Tuba Theinert Orchestra
very deep
45,0 mm (1,772 inch)
9,0 mm (0,354 inch)
33,0 mm (1,299 inch)

These are the measurements on Miraphones site. What makes the most sense for me to buy? I play a BBb tuba and use Mainly mouth pieces that have thin lips. I curently play with a Helleburg 7B and heard Miraphone makes good mouth piece.

I am stopping this post I decided on a Helleberg 120S. I already use a Helleberg 1207B and I learned that the 120S model is deeper than 7B. I think that a deeper mouthpiece will make a better tone.