Most thread lasts more years than most people realize. Think about how fabric lasts for years and it is only threads woven together.
The varigated is probably newer than the wooden spools so I am surprised it broke easily. I would have bought them from you. Gee, I didn't check where you are as I need a few little spools of thread rolled on cardboard that fits
in an antique holder I own. Treasures for sure !!!!