Percussion hammer medical use, also called Reflex Hammer.

A reflex hammer is a medical instrument used by practitioners to test deep tendon reflexes. Testing for reflexes is an important part of the neurological physical examination in order to detect abnormalities in the central or peripheral nervous system.

Reflex hammers can also be used for chest percussion.
Each hammer with 2 different sizes rubber hammer head, one relex needle and brush.
Total length 178mm / 7“
Needle Length 45mm
Brush length 42mm
Materials Stainless steel+ flexible rubber