Eyelets, I will hammer these into the wooden sphere to make the port holes. Some seem to have very few port holes and other seem to have a lot. A couple bucks got more than I can ever use.
The elastic metal stuff is used for little kids bracelets. It will be my cable for the diving bell. I have a couple tug boats in my fleet, a couple barges, and the merchant Flower Class Corvette, and I suspect several of them may soon be in the diving bell business. Cost per bell will be about $4 each, not too bad.