I purchased this online last month. I have some left over, so I'm offering it for sale. Rubber Cotton Thread (White and Black) Elastic Nylon Polyester Diameter: 0.6mm Length: Approximately 20m (per roll) *Used 2 meters of white and 1 meter of black. *A needle threader is essential when threading a needle. I don't use a sewing machine, so I can't answer questions like "Is it compatible with a sewing machine?"