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MoHMA Phonendoscope, Surgman’s 1 1/8" diameter steel circular chest piece 5/16" deep with a groove between the chest surface and the opposite side. Two holes for insertion of rubber tubes as flexible earpieces. Opposite side has a white, celluloid or similar material. On one side ther is a 3/4" horn shaped deice on an arm that swivels the horn into the center of the chest piece to serve as a phonendoscope. https://www.mohma.org/instruments/category/stethoscope/phonendoscope_surgmans/