Prym bobbins, in a pack of 4 units, reference 611322 G, are bobbins for the bobbin case of sewing machines, where the bottom thread of the stitch is wound. They differ from the metal version of the same brand by being made of plastic. Prym is a German brand founded in 1530 in Aachen, the oldest family-owned industrial company in Germany, now headquartered in Stolberg and recognized worldwide for needles, pins, buttons, and sewing accessories. Plastic is lighter than metal, making it compatible with other sewing machine models that require this type of bobbin. It is a preferred option for those who need spare bobbins for their domestic sewing machine.