The images and descriptions are of similar products. Please be sure to check the actual photos. Feel free to ask if you have any questions. The actual color is not yellow, but an orange-系 color (champagne). Size - Thread diameter: 0.1 mm; Bobbin size: 20 mm x 11 mm (OD*H), Bore diameter: 6 mm Material - The bobbins are made of plastic, durable and practical. The bobbins are smooth and won't snag the thread. The thread is made of polyester, which is strong, soft, and difficult to break, with a good feel against the skin. Features - Transparent plastic allows you to easily see when the bobbin thread is running low. They are packaged in a clear plastic box for easy collection and sorting of bobbins. Application - Sewing machine bobbins are standard size and can be used in most household sewing machines. Package Contents - 50 sewing thread bobbins, 2 plastic storage cases. 1414 uxcell Pre-wound Bobbin Thread Standard Size with 25 Compartment Box for Embroidery Sewing Machine Champagne 2 Sets