- Premium Prym plastic bobbins, specially designed for horizontal shuttle sewing machines
- Diameter: 20.5 mm; Height: 11.5 mm, perfect for JANOME, BROTHER, and SINGER (excluding Apollo hook) models
- Transparent material for easy monitoring of thread colour and remaining thread quantity
- Suitable for low thread tension systems, works without a bobbin case
- Prevents sudden thread run-out by allowing you to see thread at a glance
- Pack contains 4 bobbins for convenient replacement or backup
