Stethoscope Binaural Assembly for Master Cardiology and Cardiology III 27" (69cm) A binaural assembly that includes dual-lumen tubing, eartubes and eartips. Designed for use with Cardiology and Cardiology III. Available in various lengths and tubing colors. The binaural assembly includes tubing, eartubes, and eartips. Length is measured from tip of eartips to center of chestpiece.