Littmann Classic 3 Stethoscope Littmann Classic 3 Stethoscope Head tension can be easily adjusted to suit head size and comfort can be adjusted by squeezing or spreading the ear tubes apart. The easy-to-close, soft-close olives provide an excellent acoustic seal and a comfortable fit that adapts to individual ears. The olives seal tightly onto the end of the ear tubes, and for safety reasons, force must be applied to separate them. The flexible new-generation tubing maintains its shape and flexibility even after being firmly placed in a pocket. Its improved resistance to skin oils and alcohol, as well as its improved resistance to stains, ensures a longer stethoscope life. The new-generation tubing is not made of natural plastic latex, which benefits sensitive medical personnel and their patients. And to protect human health and the environment, the new-generation tubing does not contain phthalate plasticizers. Littmann Classic 3 Stethoscope Littmann Classic 3 Stethoscope The Classic III stethoscope is manufactured in the USA to consistently ensure uniform quality. Tubing length 69 cm Diaphragm diameter: 5.3 cm Small diaphragm diameter: 3.3 cm.