The 3M Littmann Cardiology IV is best for those who demand a stethoscope with outstanding acoustics. Features include a tunable diaphragm to hear different frequencies by slightly adjusting chestpiece pressure and dual-lumen tubing to eliminate the rubbing noise of traditional double tubes. Stethoscope.com offers a complete selection of Littmann Cardiology IV colors and chestpiece finishes. All are in stock, on sale, and available for same day engraving and shipping. Order by 3 PM ET (M-F), we will engrave and ship the same day.