Amazon.com: Compatible Replacement Tube by CardioTubes fits Littmann(r) Classic II SE(r) Standard Stethoscopes - 5mm Black on Black Tubing : Industrial & Scientific
3M™ Littmann® Classic III™ Stethoscope, 5803, Black Edition Chestpiece, Black Tube, 27 inch, 3 Each/Case | 3M Singapore
Amazon.com: (Stethoscope Binaural) Replacement Tube by Reliance Medical fits Littmann® Classic II Pediatric, Classic II SE, Select, Master Classic II, and Infant Stethoscope - Light Blue TUBING : Industrial & Scientific
Amazon.com: Replacement Tube by CardioTubes fits Littmann Classic II SE standard Stethoscopes - 5mm BLACK TUBING : Industrial & Scientific
Replacement Stethoscope Tubing - YouTube
3M™ Littmann® Classic III™ Stethoscope | 3M United States
3M™ Littmann® Cardiology III Service Guide - YouTube