Class 15 Bernette bobbins for most Bernette sewing machines:

B70, B77, B79
Chicago, London, 12, 15, 20, 25
Seville, 46, 52, 54, 55, 56, 65, 66, 80, 82, 86, 90, 92
50, 60, 70, 75
680, 705, 715, 720, 730, 740
Bernina/Bernette Deco B70, 330 & 340 embroidery machines, B37, B38