Class 15 Bobbins — Metal

Durable Class 15 bobbins for long-term use: Sewphee Genuine Metal Bobbins are crafted from galvanized cold-rolled steel. These compatible Singer bobbins resist wear and cracking and outperform plastic alternatives. Designed for front-loading machines only — not for drop-in systems.

Reliable stitching with smooth thread tension: Heavier Class 15 bobbins help reduce vibration and deliver stable tension to minimize skipped stitches. Bobbin size: 0.8 in diameter, 0.25 in inner hole, 0.45 in outer width, 0.39 in inner width.

Heat-resistant and warp-free: Built to resist heat from prolonged high-speed sewing. Class 15 bobbins maintain their shape and deliver dependable performance over time.

Smoother thread release: Polished metal surface on 2518A / 2518T bobbins allows even thread release while reducing snags and interruptions for seamless sewing results.

Packaged in Canada — precision made in Taiwan: Compatible with Singer 4423, 4452, 4432 and the same size as bobbins for Brother sewing machines. We strongly recommend checking your sewing machine manual to confirm compatibility.

Confirm your machine uses Class 15 metal bobbins and is a front-loading system (not drop-in) before purchase.

Wind thread evenly onto the bobbin, insert it into your front-loading bobbin case as directed in your manual, and sew as usual.

For best results, match bobbin size to your machine specifications and store spare bobbins in a clean, dry place.