Acme Whistles are the whistle of choice in the Gundog world and the Acme Whistle 211.5 is a standard training whistle with a lower pitch and no pea.  The 211.5 it is particularly favoured by Retriever and German Short Haired Pointers handlers.  

The 211.5 is a standard training whistle with a high pitch and has has a solid tone of a single frequency with no pea.

Available in black, baby blue, purple, orange, yellow, brown and lime green.