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Proseries Class 15 translucent bobbins in flower case, 6 CT imported Singer brand for use in front load sewing machines always replace bobbin with same bobbin type the machine came with Class 15 one of the most common types of bobbins flat and taller than the class 66 bobbins fit removable (oscillating) and top drop-in bobbin cases use with Singer front load bobbin machines, Atlas, brother, domestic (rotary), elna, Kenmore (rotary), Morse, necchi, new home (rotary/old style), Pfaff, sew more, universal, white (rotary) and Wizard machines