Cover buttons with metal rim.

Decorative cover the buttons.

To decorate pulling buttons are used rings of anodized metal like gold and Nickel.

Per room pulling the buttons your ring size and its attachment.

The appearance of decorative rings.
           

With the beginning made pulling the button, then in the special nozzle is crimped ring.

Installation diagram
        
And then there are the miscellaneous rims for pulling buttons - plug and stitch.