A sequin is a shiny disk or bead that can be sewn onto clothing, textiles, trims, or wallcoverings for decoration. The embellishments are often used to add sparkle or shimmer to fabrics. Sequins are typically made from plastic or shiny metals in many geometrical shapes. They usually feature a single central hole that is used to fasten them to the fabric, and they can be sewn to lay flat or dangle.