This heavy duty bobbin features double reinforced bands with the ceramic insert. It is flared on infeed end.
It's crucial to select a bobbin that has a ceramic tip in the tube.
If your tying thread keeps breaking, it may not be due to the tension you are placing on the thread!
Thread often snaps from the friction of the material against the tip of the tube.
A bobbin with a ceramic tip significantly reduces this problem.
Some bobbins have ceramic inserts at both ends of the tube, which minimizes the friction where the thread enters and exits the bobbin.
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I was having issues with thread breaking. Since I started using this bobbin, that has been reduced by at least 75%. Works great for lead wire too.