The V5 series is characterized by a traditional round chamber.

A17: While maintaining perfect homogeneity in every register, it allies timbre and ease with richness of sound. 
A28: The alto saxophone reference in the V5 series. Rich sound, color, brilliance, and dynamic range.
A27: The classic mouthpiece. It produces optimal homogeneity in tone throughout the instrument’s range.
A15: Very easy blowing.
A25: Similar in conception to the A15 but a little more open.
A20: For those looking for a compact, centered sound.

A45 & A55: More powerful and more open. A good choice for Jazz.