Robison-Anton Bobbin Thread by the Spool
This Robison-Anton spun polyester thread is designed for those who
prefer to wind their own bobbins, instead of using the pre-wound
bobbins. This spool contains 10,000 yards of bobbin-weight thread.
The average bobbin can hold up to 100 yards of thread - you can
make about 100 bobbins from this one spool.