Black Serger Thread (overlock) 6,000 yards, 100% Spun Polyester Direct from the Factory LA Linen ensures you are getting the highest quality item. To avoid getting second quality, damaged, or returned merchandise please make sure it is shipped to you by LA Linen. 6000 Yard Cone, 100% Spun Polyester Use for Serger, Overlock, Merrow, single needle etc. Color fast yarn dye overlock