Cutex Brand Bobbins Bernina 117, 217, 540, 740, 750, 850, 950 Sewing Machines - Pack of 10 Pack of 10 Steel Bobbins for Bernina Sewing Machines. Bobbin size : 22.0mm diameter X 6.5mm thick These are high quality bobbins made of all steel with holes on both sides. For Bernina 117, 217, 540, 640, 740, 840, 850, 940, 950 machines and more