Thank you for viewing! This is a set of 4 bobbins with thread for a home sewing machine. Compatible with sewing machines from various manufacturers such as Singer, JUKI, TOYOTA, Brother, and Janome. The bobbins are compatible bobbins with genuine quality. The thread (spun thread) is polyester thread, size 60, suitable for a size 11 needle. Bobbin ・Size: Height 11.5mm x Diameter 20.5mm Thank you!