Since 2014, Selmer have developed and tested with clarinettists from across the world two new barrels with special new bores. The Centered Tone barrel suits players who are looking for a very focused and compact sound. The Centered Tone barrels have a smaller bore than that of the standard Presence and Privilege barrels. The Evolution barrel provides better comfort for clarinettists playing with the more open set-up. The Evolution barrels have a larger bore than that of the standard Presence and Privilege barrels. Just like the standard Presence and Privilege barrels are available in the following lengths: 64.5mm, 65.5mm and 66.5mm.