Becker Alto Whistles are available  in these keys:   G, A, and Bb.   They have a delrin fipple block (mouthpiece).
These bigger brothers in the whistle world are built to play in tune, having a solid low note, yet easily 
jumping to the higher octave.  The lower mellow sound is so pleasing to the ear!
Alto G Whistle with shipping to the USA included
Plays in G and C easily.  PVC with delrin fipple block
$
22.00    
Alto A Whistle with shipping cost to USA included
Plays in A and D easily.   PVC with delrin fipple block
$
22.00    
Alto B flat Whistle with shipping to USA included
Plays in Bb and Eb easily.  PVC with delrin fipple block
$
22.00