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MoHMA Stethoscope Astatique Complex circular stethoscope head, 1.75" x 1". There are thermoplastic membranes on each side from two heads. The smaller 1.25". There are arms for tubing, which emerge from the sides and go in opposite directions. There is also a button on what appears to be a plunger on the side.This is the same as the Huston Akuophone. https://www.mohma.org/instruments/category/stethoscope/stethoscope_astatique/