Made in England by Kerry Whistles.
Optima Alto G Tuneable Whistle by Kerry Whistles
Optima Mezzo Bb Tuneable Whistle by Kerry Whistles
Optima Tenor Eb Tuneable Whistle by Kerry Whistles
Optima Mezzo B Tuneable Whistle by Kerry Whistles
Optima Tenor D Tuneable Whistle by Kerry Whistles
