Knurled inside to hold thread and prevent tangling;Works with bobbin case 0015347200/0015347301;High quality steel to spin freely in the bobbin case;Bernina 120, 125, 130, 131, 135, 140, 145, 150, 153, 155, 160, 163, 165, 170, 220, 230, 240, 330, 430, 440, 530, 532, 534, 600, 610, 630, 642, 644, 700, 707, 708, 709, 717, 718, 719, 730 Record, 731, 732, 800, 801, 802, 803, 807, 808, 809, 810, 811, 817, 818, 819, 830, 831, 832, 900, 910, 930, 931, 932, 1004, 1005, 1006, 1008, 1010, 1011, 1015, 1020, 1030, 1031, 1080, 1090, 1120, 1130, 1230, 1260, 1530, Activa 210, B215, B330, B380