The shank
The back  bore of the mouthpiece influences its ease of play to a percentage equaling  its percentage of length Most  musicians  are  not  aware  of  the  importance  of  this  part  of  the  mouthpiece.  Mouthpieces  are  usually Classified a ccording to cup depth and rim width, and the only information one will get by looking through th e bo re is the degree of pollution.
The shape of the back bore can hardly be determined with traditio nal methods as this bore is too long and narrow
to  be  measured  exactly.  People  began  to  realise  the  importance  of  this  part  of  the  mo uthpiece  with  the introduction  o f  the  screw-rim  mouthpiece.  The  mouthpiece  works  like  a  jet,  its  shape  determines  speed  and intensity of the  air  compression  inside the  instrument, as well  as  the resultin g  standing  wave. So the musician
can  easily choose his/her ideal  tone  system.  The  relevant  aspects for  the  musician's choice  of  the  right  shank
should be ease of play and desired tone colour. Sometimes it will be impossible to  find all aspects embodied in one and
the same mouthpiece. Our mod ule system will satisfy the musician's demands to a large extent.
In the following the  number of the shank is inversely proportional to the volume of the shank. This means that number one is a b ulgy shank with a wide bore, whereas number eight is narrow and slim.
Wide shanks  produce a full big tone, the high register is often hard to play. Narrow  shanks produce  bright and sharp tones.

In the list you will find  shanks that have letters in their names. These shanks  are newly developed  models  and were invented in order to add some characteristics that the ones with numbers only do not have.
Shank assortment: (ranking according to volume)
下哨管分类：（按体积大小排名）
W1:   Copy of an old Viennese shan k. Trombone-like sonorous sound.
W1:  
1:     Bore of the G1 mouthpiece.
2:     Beautiful mellow tone, standard bore G2.
G:    Original version of shank Nr. 2; similar to G2 in terms of sound quality and intonation.
W2:   Shape of shank W1, however with reduced volume.
L:    Guaranteed precise ease of play, beautiful centred tone.
P:     All-round orchestra shank, brilliant sound pattern.
3:     Precise ease of play, bright to ne, standard bore G3.
4:     Especially suitable for young players, a bit too wide for piccolo.
5:     Big tone for piccolo, long Seele for the right no te in the high register.
6:     For musicians who need deep cups but who do not have enough pulmonary volume.
S:     Easy to play, without significant loss of tone quality.
B:    For Jazz and entertainment music, easy to play.
J:     Narrow dimensions, bright sharp tone, supports to reach notes in the high register.
N:    For trumpets with piston system, good results in combinatio n with piccolo trumpet.
7:     For Jazz and entertainment music. Bright, sharp tone.
17:    Copy of a legendary shank of Bach Corp. Mt. Vermont.
8:     Extremely narrow back bore for inpidualists.
On request we provide your favourite model  of our mouthpiece assortment  with the  back  bore of  your choice.
New models are in planning, technical modification subject to change without notice.