Our SINGER Bobbins are Manufactured using Specific SINGER Engineering Specifications. Timeless Quality Control Detail Goes in to Every Bobbin Shown on This Site. Unfit Bobbins Can Cause poor Stitch Quality, Machine Jambing, and Countless Frustrating Problems. Each Bobbin Has Our 100% Guarantee to Fit and Function Perfectly. Our Bobbins For All SINGER Models. Futura, Curvy, Simple, Tradition, Heavy Duty, Quantum, Heritage, Promise, Superb, Athena, Sew Mate, Touch & Sew, Fashion Mate and more.