Larger bores were popular during the first half of the 20th century. For those players who enjoy the great flexibility of these designs,Rossi offers the following :

15 mm bore Boehm System, AL Model
Based on the Boehm clarinet made by E.J. Albert in 1930.
Very flexible and rich-sounding.

15.2 mm bore Boehm System, English Model
The English model is based on a pair of 1010 clarinets from 1938.
Ideal for those who follow the traditional English school.
Used by renowned musicians such as Valdemar Rodríguez (principal at the Simón Bolívar Symphony Orchestra of Caracas), Jane Ellsworth (Professor of Music at Eastern Washington University ), and British soloists Gervase DePeyer and Colin Parr.

15.2 mm bore Boehm System, Viennese Model
Inspired  by  pre-war instruments made by Koktan in Vienna , this model is unique in that it features the Boehm key system. It features shorter barrels to compensate for its comparatively long body (as compared to the English Model). Produces a rich, focused sound. Used by Luis Rossi for his concerts and recordings.