I have the Babylock Ellure the manual says it takes a bobbin part code X52800-150. 11.5MM (7/16 inch). I have found that if I buy the bobbins at Walmart they don't wind up right and the machine doesn't work as well. I get them from a sewing center in town that carries parts for lots of different machines. They aren't that much more expensive and they work!! Hope this helps.