The prewound bobbins look like they are size L, which can be used in most domestic machines you just pop the cardboard off and use them in the bobbin holder. I use these all the time instead of winding bobbins. They hold a lot more thread than any bobbin that you can wind yourself.
The bobbins are a nylon thread that can be used for couching as a decoration, or used for hand embroidery or big stitch quilting with a needle.
I have found that with some of those older embroidery patterns that the ink no longer transfers so you will have to test them.