This Bernina Jumbo Bobbincase is designed for the 4, 5 and modern 7 Series. The 720, 740, 770, and 790 are the models it works with. There are two types of Jumbo Bobbincase. Mixing them up may lead to poor stitch quality. So if you have a 4, 5 or one of the listed 7 series Berninas, this is the bobbincase you need. It can be identified by a Triangle stamp on its side. I’ve included a photo that shows the triangle stamp. This Bernina Jumbo Bobbincase is designed for the following models, 4 Series 5 Series 720 740 770 790
