Tortoise 4 Cones of 3000 Yards Each Spool Thread for All Purpose Serger Overlock Quilting Sewing Machine 100 Polyester 40S/2 White · We are manufacture of specializes in producing sewing products of various specifications integrates dyeing production and sales Tortoise was one of our brand.with nearly thirty years of sales experience in the industry we always work hardly to make prodcut better . All the time, take customer first as the starting point, always adhere to the high quality products to repay customers, we have been adhering to the purpose. One project has four spools with each one 3000 yardstotal 12000 yards. This product works on most brands of sewing machines or high-speed sewing machines, We have adopted advanced twisting technology and air splicing technology, almost no joint in one cone, use electric control of the silicone oil, more stable quality,no longer worry about for the break off. The sewing thread is made of high-quality 100 POLYESTER, polyester is soft with high strength .it is not easy to be fraying or breaking, not discolor or shrink. The color fastness to washing and sunlight could be over level 4 , the mean value of breaking strength above 11 N. breaking CV () in 5.5-7.5, hairiness ratio of 4mm is under 0.3, We attach great importance to the quality of products, make sure the produt more stablect We provide 30-day money-back and 12-month warranty. Feel free to contact us if you have any concerns