ITEM NAME:10* Aluminum Industrial Sewing Machine Bobbins Metal Supplies 21mm Carft Sp Y0B1 description: 100% high quality Diameter: about 21 mm Diameter: 2.1cm thick: 0.9cm Material: Aluminum Machine: Single Needle Flat Car Color: as shown Applicable to: bobbin suitable for ordinary flat car. Computer flatbed, aluminum, anti-wear and anti-rust, anti-rust Bobbin computer with bobbin bobbin industrial sewing machine bobbin Package Included: 1pc / 10pc A.Bobbin computer with bobbin bobbin industrial sewing machine bobbin. Applicable to: bobbin suitable for ordinary flat car. Computer flatbed, aluminum, anti-wear and anti-rust, anti-rust. Machine: Single Needle Flat Car.