3M Littmann Master Classic II Stethoscope, Black Plated Chestpiece and Eartubes, Black Tube, 27 inch, 2141 - Walmart.com
Amazon.com: (Stethoscope Binaural) Replacement Tube by Reliance Medical fits Littmann® Classic II PEDIATRIC, Classic II SE, Select, Master Classic II, and Infant Stethoscope - GRAY TUBING : Industrial & Scientific