The Ultimate Sparkle Be dazzled by the shine and glitter of this metallic effect thread. SULKY SLIVER™ is. It is a thin, flat, ribbon-like, (solid-color) foil, which makes it brilliantly reflective so you can add the ultimate sparkle to all of your decorative projects. The surface of the embroidered design appears to be very uniform and smooth, enhancing the glittery effect of SULKY SLIVER. . SULKY SLIVER is available in 24 dazzling colors.