The ABN Cardiology Stethoscope (Model SS-011-BK) features black tubing and is designed for superior acoustic performance. It has a super-sensitive diaphragm to detect low-frequency sounds and an extra deep bell with a non-chill ring on both sides for patient comfort. The soft, flexible Y-tubing includes a double-leaf internal spring for durability, and the ergonomically designed binaural pieces ensure user comfort. A spare diaphragm is included.