Black knee high boots size 8

Like new women’s black knee high Rialto boots with rivets Zip up from the ankle Man made materials Size 8 women’s Like new condition- worn literally two times indoors Material looks like leather but is not and had rivets / studs up the sides. Widest part on upper calf is about 15-16 inches They are 20 1/2 inches tall and sit just below my knee cap and I’m 5’6