Thank you for viewing. This is a set of 11 industrial woolly nylon threads used in a sewing factory. Ideal for overlock and cover stitch machines, and suitable for sewing knit and stretch materials. ◎ Highly elastic ■ Material: 100% nylon ■ Condition: Used (long-term storage / approximately 10 years old) * Due to long-term storage, there may be some scratches and slight discoloration on the paper cores. Thank you for your consideration.