Easy to store: Our sewing machine metal spools are packed in a plastic transparent box, and each spool is placed in a separate position, which is very neat, easy to store and access,dust-proof and loss-proof. Bobbin specifications: height 1cm, diameter 2cm, inner diameter 0.7cm Perfect material: Spool made of high quality metal, , practical, reusable. Exquisite workmanship: The and edges of the spool are polished so that the smooth and edges not cut , and not scratch your fingers or skin. Reliable and reliable quality. Wide Application:The standard size to fit most home embroidery and sewing machines.It is a for grandma, mother, wife, sewing lovers, sewing beginners.