Genuine Brother Accessory. Designed for use in Brother embroidery-only machines. Reusable bobbins pre-wound with #90 white embroidery thread, for machine embroidery. Includes 9 bobbins, each pre-wound with 85 yards of 90 weight white embroidery bobbin thread. 11.5 bobbin size. Designed for optimal results for models that originally came with #90 bobbins. Not for use with Brother sewing or embroidery/sewing combo models.