Assertion: skin | /r/HasProperty | 4 mm thick
Facets:
Source sentences:
text: The skin on the palms and the soles of the feet is 4 mm thick and is the thickest skin on the body.
text: The skin on the eyelids is only 0.5 millimeters (mm) thick, while the skin on the heels can be up to 4 mm thick.