Hi Vickie,
It looks like the largest hoops we have are about 8 by 15 inches give or take. the RM5 for Bernina is a good bet. Snap-Hoop Monster / RM5 210 x 400 mm for BerninaEmbroidery Machine Hoops by Designs in Machine Embroidery
Or if you're looking more into long projects, there's a midi hoop that's 6.5 by 10 inches about. Snap-Hoop Monster / RM6 Snap Hoop Monster 265x165mm midi hoopEmbroidery Machine Hoops by Designs in Machine Embroidery
Vickie S.
what is the largest magnetic hoop you have for a 770 Bernina in inches please