Detail 01
18mm cup diameter
The largest cup here. More lip vibrating means a fuller bottom end and more volume, but it demands steady air support.

Independent shopping perspective
Gold-finish French horn mouthpiece with the largest cup in the Classic line at 18mm. Built for low-horn players who need volume and range.

Strong match
Consider the trade-offs
What matters in use
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 01
The largest cup here. More lip vibrating means a fuller bottom end and more volume, but it demands steady air support.
Detail 02
Standard rim. Roughly a millimetre wider than the N-series rims, so more comfort and endurance, slightly less agility.
Detail 03
The widest throat in the line. Passes more air with less resistance, which is what lets it push real volume.
Detail 04
Shared across every size in this line, so moving between sizes changes cup and rim feel, not the underlying blow.
Detail 05
Cosmetic surface only. Cup, rim and throat dimensions are unchanged, so playing response comes from the size 4 geometry.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
The 5 is the better starting point in this line — 17.50mm cup, standard rim, shaped funnel cup. The 4's larger cup asks for more developed air support.
Same 18mm cup and 4.70mm throat. The 4N narrows the rim to 3.93mm, which favours flexibility. The 4's 5mm standard rim favours comfort and endurance.
That is not its strength. It is built for volume and range with a large cup. For an easier high register, the 7 or 7N are the ones to look at.
No. The finish sits on the surface. Tone and response come from the 18mm cup, 5mm rim, 4.70mm throat and barrel backbore.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.