This service is not a product; it's an alteration service offered by our factory in response to customer requests. When you add this package to your cart, it signifies that the bra you've selected will be modified using a stitching machine in our factory to transform it into a backless and strapless design. This customization, when done in the right size bra, ensures a better fit and shape, as silicon products are often only a temporary solution. With this package, you will also receive transparent shoulder and back straps, along with an adjustable alterable strap.