There are counterfeit Littmann stethoscopes out there so BE CAREFUL! Littmann.com has a list of approved distributors/retailers. Buying the stethoscope online will be cheaper than at a store but...
The new Copper and Brass on the Littmann Cardiology III chestpieces are finishes only. The chestpiece is still made from stainless steel, but then has a thin layer of the Copper or Brass finish. It...