Premium Materials---These sewing machine bobbins are made of high quality aluminum material, which are solid and durable, wear-resistant and -resistant, not easy to damage, and can be used for a long time Easy to Use---These sewing machine bobbins are easy to install and use, which is an essential part of the sewing machine, Compact size and light weight for easy storage and carrying. Product Advantage---These sewing machine bobbins with exquisite craftsmanship, all of the surface is smooth and no scratches. A good sewing machine accessory to make your work more efficient. Satisfaction Guarantee---We greatly value our customers and want you to be completely satisfied with your purchase. If you aren't happy with your shopping experience or product, we urge you to contact us so we can resolve the issue Universal & Standardized Design---These sewing machine bobbins adopt standardized design, which is universal for ordinary flat sewing machine.