Here's what Perplexity found:
No detailed technical specifications (rim diameter, cup depth, throat size, backbore) for the **Bel Aire Rite Cup #41** mouthpiece used by Frank Rosolino could be found in available authoritative sources. Historical profiles confirm that Bellaire (sometimes spelled Bell-Air) Rite Cup mouthpieces were significant among session brass players in the 1940s–50s and that Rosolino had Terry Warburton create a copy in the 1970s, inspiring today's Warburton "Rosolino" model. However, measurements such as **exact rim diameter, cup depth, and throat dimensions** are not published in either mouthpiece catalogs or historical PDF archives.[1]
### What Is Known
- The mouthpiece was considered notably small, shallow, and bright in sound.[1]
- It was rare, influential, and closely copied for the modern Warburton Rosolino model.[1]
- Exact measurements are **not documented** in standard reference PDFs or online databases of mouthpiece dimensions.[1]
For the most accurate modern equivalent, contacting Warburton directly or measuring an original #41 mouthpiece (if accessible via a collector or museum) is recommended, as only anecdotal descriptions—not numeric specifications—are currently archived.[1]
[1](
https://brasshistory.net/Bellaire%20History.pdf)
[2](
https://www.thomannmusic.com/bob_reeves ... _41_es.htm)
[3](
https://gregblackmouthpieces.com/produc ... outhpieces)
[4](
https://sg.yamaha.com/en/products/music ... eries.html)
[5](
https://www.musiciansfriend.com/thehub/ ... ying-guide)
[6](
https://www.nickrailmusic.com/c-416-mouthpieces.aspx)
[7](
https://www.alshallalchannel.com/Cup-Co ... Rim-925803)
