The MDF® NEO™ > Infant + Neonatal Stethoscope is specifically handcrafted for infant and newborn patients. It delivers accurate auscultation of heart lung and Korotkoff sounds with acoustic integrity and clarity. An ergonomic design ensures comfort for the doctor and patient even during extended use. Precisely handcrafted the Deluxe Infant and Neonatal Stethoscope is the standard in auditory diagnostics with unmatched performance and durability. Chestpiece:The handcrafted lightweight infant and neonatal dual-head chestpiece fitted with a unique raised ultra-thin fiber diaphragm and full-rotation acoustic valve stem is constructed of quality chrome-plated brass. Comfortseal™ eartips:Soft silicone ComfortSeal™ eartips are phthalate-free and clear for hygienic purposes. To ensure proper fit and isolation of sound MDF® ComfortSeal™ eartips are available in three sizes: small regular and large. Ergonomax™ headset and Safetylock™:Hand polished pre-angled aluminum headset features a patented internal dual-leaf spring construction for durability. Patented SafetyLock™ eartip adaptors lead the industry in user safety. Acoustic Tubing:Constructed of thicker denser latex-free PVC the Y-configuration non-stick acoustic tubing provides insulation for superior sound transmission and seals out ambient noise while preventing the cracking and wearing that can occur from repeated use. Acoustic Pyramid Chamber™:A patented internal metal-alloy chamber located in the acoustic tubing below the spring keeps the tubing channel open for maximum sound transmission into the headset.