25 Pieces Premium Bobbins: 25 top-quality sewing machine bobbins, neatly stored in a durable plastic storage box for ultimate protection and easy transport. High quality, durable construction: premium quality plastic bobbins can be reused many times, with security notch for consistent bobbin thread winding, The transparent plastic makes you to see your bobbin thread running easily. Ultimate protection: which is why our bobbins come in a clear case with individual slots for each one, allowing you to keep them easily accessible and beautifully arranged. Standard Size: The sewing machine bobbins is standard size, which can be used on most household sewing machine like bro-ther,jano-me,sin-ger,baby-lock and so on. It is ideal for anyone useing an embroidery machine or a sewing machine in daily life. Class 15 size: 7/16 inches deep bobbins fit home sewing and embroidery machines that use class 15 bobbins; please confirm the bobbin size specifications on user product