The Littmann Cardiology IV Diagnostic Stethoscope Model 6155 is a deep green color that is flattering against your lab coat or scrubs. At 27" in total length this model fits comfortably around your neck, and stays put! This stethoscope is available in Littmann's lush green tubing with a stainless steel chestpiece and binaurals. Go green with this update to classic black! 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.