Type of sewing thread: Machine thread Silk-like luster. Filament thread with excellent seam appearance. Ace Crown Filament Machine Thread is a high-strength thread with moderate elongation, excellent durability, and is a top-quality machine thread. In particular, because it uses excellent raw yarn with high heat resistance, it has good sewability and provides beautiful stitching. #Olaf184 Industrial Thread Industrial sewing thread Teijin Tetoron Ace Crown 50/3000m Black...2 pieces If you would like to change the color or purchase 3 or more, please feel free to comment. I will accommodate your request. If you would like a colored thread, please refer to the sample book. Please comment for stock confirmation. Can also be used with home sewing machines. Brand new, unused. Thank you for viewing. Please read the profile before purchasing. #TeijinTetoron #AceCrown #MachineThread #Industrial #HomeSewingMachineThread