ITEM NAME:10x Metal Bobbin Spool for Home Sewing Machine I3M5 10x Metal Bobbin Spool for Home Sewing Machine I3M5 The bobbin is 20mm diameter and 10mm thick With a notch in the center for the re-winder Fit for most types of home sewing machines Material: Metal Color: Silvery The most commonly used metal bobbin for most types of home sewing machines. The bobbin measures approx. 20mm in diameter and 10mm thick. Package Included: 10x Metal Bobbin Note:Light shooting 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.