Size 15K Which Is 21mm Diameter x 11mm Width Ideal For All Makes Of Domestic Sewing Machines The item is a set of 50pcs 21mm domestic sewing machine bobbins, which are made of clear hard plastic, and suitable for most domestic sewing machines including Singer, , , , Euro-Pro, , , White, , , etc. Features 50 pieces of the clear plastic sewing machine bobbins in one set be sold together. Color: transparent. Material: hard plastic. Size: Diameter: about 21mm ; Height: about 11mm . and high quality 2.1cm Clear Plastic Domestic Sewing Machine Bobbins. Fit for most domestic sewing machines, including Singer, , , , Euro-Pro, , , White, , , Simplicity, and , etc. Simple and practical design, and easy to use. Package Including 50 * 2.1cm Clear Plastic Domestic Sewing Machine Bobbins for /Singer / / Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.