Specialty yarns are used for embroidery in particular. Specialty threads give very distinct appearance that gain attention for sure. A certain type of thread shows up color variation after every 3or4 inches. Then, some threads give a light and reflective effect. Metallic finish and matte finish are other attractive types. Pearl cotton, metallic pearl cotton, rayon, and twisted and braided threads are used in designs and patterns that grab a lot of attraction.