Brand Black knee high black boots with side zipper

Black knee high boots (very to of boot to bottom of heel measures approximately 24 inches). There is no brand or material mentioned on the boot. I don’t believe these are real leather due to the peeling on the back and sides.Scuffs everywhere.The exact size is not indicated or has worn off the soles but my sister wears anywhere from between a 6.5 or 7.The boot measures approx9 inches and heel measures 4.5 inches. There is wear on the soles, heels and front. See pictures for more details.