Pearl Crown Rayon is our premium decorative serger thread designed for beautiful serged hems and edges. This lustrous rayon thread has brilliant shine and exceptional strength, making it perfect for decorative hems and rolled hems. Pearl Crown Rayon is a heavy (thick) thread, designed to be used in the upper or lower looper of a serger, not as a needle thread. Available in solid and variegated colors on 100-yard spools.