Tuppy's Emporium Pre-wound Bobbins
Tuppy's Emporium
Pre-wound Bobbins 
These are top quality pre-wound plastic bobbins from Robinson Anton. They're designed for home sewing machines, but offer commercial strength. They're on a proper plastic bobbin, so will work right to the end.

It's a pack of 12 bobbins, each wound with 135 yards of highest quality filament polyester bobbin thread.

Price:   £6.00