Marks & Spencer Silver Tone CZ Interchangable Fashion Bra Straps

Marks & Spencer silver tone CZ interchangeable fashion bra straps. There is no size on these but I would say they would be better for ladies with smaller cup sizes. They don't seem like they would actually offer much in the way of support, just more decorative to add to a strapless bra that has the option for adding straps. Smoke free, pet free home.