The “default” spool for tie line has traditionally been cardboard. It is light weight, but, more important, it is less expensive for the manufacturer.
The problem with cardboard is that it can’t stand up to ongoing handling, particularly if moisture is involved.
Long before you have used up the line on a cardboard, these spools are tearing, bending, and generally just falling apart.
BuyTieLine.com offers #4 tie line (both glazed and unglazed) puts their tie line on a tough plastic hub. It can stand up to handling without ever breaking down and it is moisture proof.
These hubs look the same at the end of the spool as it does at the beginning.
Best prices and best quality. You get them both here.