Sturdy metal bobbins with ten ventilation holes support smooth thread delivery in many domestic machines. This Esprit pack of 3 fits most Japanese machines—always confirm your model’s bobbin style in the manual. Precision‑made rims help wind evenly and reduce vibration at speed. Keep spares pre‑wound with commonly used colours to streamline piecing, garment sewing and repairs. Designed for everyday sewing and craft use, it delivers reliable performance and clean results on typical home projects.