Maxi Lock Swirls Rainbow Swirl Serger Thread 53-M67 Maxi Lock Swirls Rainbow Swirl Serger Thread Decorative 100% Spun Polyester Great variegated colors, excellent seam strength, consistent sew abiltiy, mildew and UV light tolerant, shrink and abrasion resistant. Thread is ideal for decorative serging applications. 18 colors to choose from. 3000 yd cone. Maxi Lock Rainbow Swirl Thread 53-M67