Prym CB bobbins are designed for home sewing machines using the central bobbin (CB) hook system, ensuring reliable and smooth thread delivery. With a standard size of 20.5 mm in diameter and 11.7 mm in height, they are compatible with most domestic machines. Available in durable metal or transparent plastic, the metal option offers long-lasting performance, while the plastic version allows easy monitoring of thread colour and quantity. Prym offers these bobbins in packs of 5 (metal) or 4 (plastic), and they can also be stored in a convenient Prym bobbin box holding 12 units.