Chic black slingback 2.5” (50 mm) heels by Manolo Blahnik. His classic design with pointed toe, slightly stretchy heel strap and curved stiletto heel in a matte black leather. I have used these a few times and because I have big feet they are not comfortable at all, though I have enjoyed looking at them in my closet for 10+ years! They are in a Balenciaga shoe bag, can’t explain why!? Size 42 which is 11-11.5 US in my experience