3M™ Littmann® Master Cardiology™ Stethoscope, Sold As 1/Each Solventum 2161 Tunable Diaphragm Allows The User To Conveniently Alternate Between The Low- And High-Frequency Sounds Without Turning Over The Chest Piece Patented Tunable Diaphragm Conveniently Alternated Between The Low And High Frequency Sounds Without The Need To Turn Over The Chest Piece Handcrafted Solid Stainless Steel Chest Piece For Superior Acoustics Two-In-One Tube Design Eliminates Tube Rubbing Noise Excellent Acoustic Seal And Comfortable Fit With The Soft Sealing Ear Tips Overall Length 27 Inch Stethoscope, Litt Cardio Master Blk 27" 3M Cardiology Stethoscope 3M™ Littmann® Master Cardiology™ Black 1-Tube 27 Inch Tube Single Sided Chestpiece 3M™ Littmann® Master Cardiology™Sku: Mck-372940_Ea Mfgr Sku: 2161372940_EaShips In 14-21 Days