Deluxe doctor's single head stethoscope

1.Silver single head chestpiece , Ergonomic design for the back . so as to get comfortable use.
can catch both low frequency and high frequency sound by pressing the back in different pressure .
2.considerate anti-chill ring design
3.connecting spring is embedded ,ear tip is specially designed for suiting the ear structure.
4.zinc alloy chest piece with MATTE SATIN finish . excellect sound conduction. little acoustic attenuation .