Features: Inner Diameter: about 2.6cm/1.02in. Outer Diameter: about 4cm/1.57in. Bobbin winder rubber rings is a necessary spare part accessories for sewing machine bobbins. Easy to install and remove, the old one can be easily replaced sewing machine Rings winder. These bobbin winder rings is essential accessories for anyone serious about their sewing projects. Specifications: Component: Silicone Rubber Inner Diameter: about 2.6cm/1.02'' Outer Diameter: about 4cm/1.57'' Color: 2 Kind Optional Package Includes: 10 Pcs/Set Bobbin Winder Rubber Rings note: Please allow 1-3cm errors due to manual measurement. Due to difference betweeen different monitors,the picture may not reflect the actual color the item. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia