Hemline Self Cover Buttons: Metal Top Various sizes available. Cover these buttons with fabric to make special buttons which can personalize and decorate garments and accessories. Easy to fit snap-on back plate, no tools or sewing required, though self cover tool can be bought separately if required. Composition: Brass Compatible with Hemline, Prym and Milward button tools. If you would like to see how to cover the buttons, please take a look at the video on my YouTube channel: https://youtu.be/YHxb3D44rm0