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The Littmann Cardiology IV Stethoscope Model 6239 features the plum tubing set with black binaurals the things that go in your ears a high-polish rainbow chestpiece and violet stem. It is a shimmering golden color with traces of blue. A very unique finish that is cheery and fun. The 3M Littmann Cardiology IV Diagnostic Stethoscope had some big shoes to fill when it replaced the Cardiology III but it managed to exceed expectations. The most popular stethoscope for medical professionals and students in training the 3M Littmann Cardiology IV Diagnostic stethoscope offers great acoustic and versatility that no other stethoscope can rival. With a quick turn of the chestpiece the 3M Littmann Cardiology IV stethoscope can be used for either adult or pediatric patients. The patented technology of the one piece tunable diaphragm lets you hear both high and low frequencies sounds from the same side. Single-piece tunable diaphragm allows for better sound quality and less chance of sound interference. Tunable diaphragms on both the adult and pediatric sides of the chestpiece.