Alto A-601 (Brass)   .E Flat .25 tone holes & Keys .Made in Taiwan (Hand made) .Disassembled tube structure .Shelled Key .Genuine import Ital......           Alto A-602 (85% Red Bronze)   .E Flat .25 tone holes & Keys .Made in Taiwan (Hand made) .Disassembled tube structure .Shelled Key .Genuine import Ital......           Alto A-603 (95% Red Bronze)   .E Flat .25 tone holes & Keys .Made in Taiwan (Hand made) .Disassembled tube structure .Shelled Key .Genuine import Ital......           Alto A-604 (Cupronickel)   .E Flat .25 tone holes & Keys .Made in Taiwan (Hand made) .Disassembled tube structure .Shelled Key .Genuine import Ital......           Alto A-701(65:35 Brass) -   .Paten Number: M291063 .65:35 Brass .Adjuste C# tune hole .New mechanical structure .Improved connection stick ---------......