Red and Black Color Block Pumps Size 6

Red and black color block high heel pumps. Heel height is about 3 inches. I ordered these and they were a size too big and I just never returned them. On the website the were listed as a 5.5 but based on the European size 36 they fit a women's size 6. I'm normally a size 5-5.5 depending on the shoe. These are new, only worn to try on.