NWOT Calvin Klein black open toe, open back shoes

Black ( Leather?/vegan leather ?) I can’t tell. Shoes are an open toe and strap back shoe. They have an asymmetrical block heel. Toe detail has gold studs and gold hardware for the buckle. Full foot coverage for style and comfort. The size inside is hard to see, but in the left shoe on the left side you will find it. Size 5 Strap on back is 1 “. Heel is right under 4” At widest part of foot is measures 3” Excellent condition, never worn