DESC: Features:• The snap-on rim will not rust nor corrode. Unlike threaded rims, it will not come loose nor fall off.• There is a crack-resistant, reinforced yoke that allows you to fold the scope easily into your pocket without kinking or breaking.• The internal double-leaf binaural spring helps assure a long life and allows easy adjustment of eartube tension. The lightweight eartubes are durable and abrasion-resistant.• Features a nonchill rim on both the diaphragm and bell, so there's no need to warm them up.• Each stethoscope comes with patented 3M™ Littmann™ Snap-tight Soft-sealing Eartips designed to assure an excellent acoustical seal in the ear canal and maximize comfort.Single-lumen tubing is available in a variety of popular colors. Three-year warranty.