It is pronounced, and sometimes spelled, "bosun's call". The pipe consists of a narrow tube (the gun) which directs air over a metal sphere (the buoy) with a hole in the top.The player opens and closes the hand over the hole to change the pitch. The rest of the pipe consists of a "keel", a flat piece of metal beneath the gun that holds the call together, and the "shackle", a key ring that connects a long silver or brass chain that sits around the collar, when in ceremonial uniform. The item "LOT OF100 PC NAUTICAL ANTIQUE BRASS BOATSWAIN'S PIPE BOSUN WHISTLE KEY CHAIN" is in sale since Sunday, April 15, 2018. This item is in the category "Antiques\Maritime\Maritime Bells, Whistles & Horns".woodexport86-8" and is located in SAHARANPUR, UTTAR PRADESH. This item can be shipped worldwide.