Abstract: A bobbin comprises a hollow hub adapted to cooperate with a latch and post on a bobbin casing housed in a sewing machine. The latch and post enter the hub and guide the bobbin into place in the sewing machine. Thread previously wound around the hub is adapted for paying out for use in the sewing machine. Before the bobbin is inserted for use in the sewing machine, a membrane is placed across the hub at one axial end to seal that end and form a reservoir within the hub, and a lubricant such as sewing machine oil is added to the reservoir. Another membrane is placed across the hub at the other axial end of the hub to seal that end and completely seal the oil within the reservoir. When the bobbin is inserted into the bobbin casing, the latch punctures both membranes, the post guides the bobbin so that it is properly seated within the bobbin casing, and the sewing machine oil contained in the reservoir drains out and lubricates the sewing machine.