Constructed from acoustically-superior stainless steel the MDF® MD One® Pediatric Stethoscope 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. The MD One® Pediatric Stethoscope is a premier diagnostic instrument with unmatched performance durability and aesthetics. Chestpiece:The handcrafted stainless steel dual-head chestpiece is precisely machined and hand polished for the highest performance and durability. 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 stainless steel 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.