ERKA MEMBRANE The convex ERKA. membrane provides excellent resonance and sound transmission. BELL The reversible double horns are made of polished, high-gloss chrome-plated brass. In addition, the absence of porosity makes the surface particularly hygienic. SPRING AND TUBE The stethoscope tube features two parallel internal channels. This prevents the rubbing noises characteristic of two separate tubes. EAR TUBES The ergonomic, adaptable shape of the ear tubes guarantees perfect comfort. The default 15° inclination of the ear tubes adapts to the characteristics of the user's ear canal. EARSETS Ergonomically shaped soft earmolds adapt to the shape of the ear canal, providing comfort and an excellent acoustic seal against ambient noise. 10-year warranty Ref : IBSTS18