You can buy very nice ones made of foam-core at Amazon.co --look under the heading "kumihimo". In fact, for around $13.00, you can buy a clever little kit which includes the aforementioned disk, some small cord bobbins, and instructions. For a wee bit more, you can get a larger kit with the same, plus various colors of braiding cord. And for a LOT more, you can buy a full-sized wooden maru-dai (the grand mother of the foam disks), but the foam ones are a great way to find out whether kumihimo is your cup of tea, without going broke.
you can make one easily enough using a paper plate (I suggest a strong one not flimsy but either will do) take anything round and trace a circle on it. Cut 4 slits (just a little way in) ie: North, South, East, West, then cut another one in between those. That's it. If you want a sturdier one they do sell them online. Google Kumihimo Braiding Disc and I'm sure you will find them.
The length of the strings would depend on the finished length you want it to be, I suppose. If you want a bracelet, make the strings shorter, make them longer for a necklace, etc. I think if you took the desired finished length and added a few inches for "safety, loss and tying off" you'd be on the right track.
Oh, wow! I'd never heard of plastic bag yarn before, but what a great idea. - thanks for introducing me to this - Now I have a million ideas hatching in my head...
I will be teaching this technique to a bunch of kids at our summer camp this year. It is a really neat instructable and has motivated me to start learning this kumihimo art. Thanks a lot !!
What a great job of explaining how to make a simple friendship bracelet! I viewed some pretty confusing demonstrations that made my head spin. This one was clear, quick, and has you up and running before you know it. I hope to see some more elaborate braiding in the future. Fantastic! Thanks!!
I made one for my boyfriend following your tutorial. I just changed the end parts and used a barrel clasp to join the ends. This is the one I made. :) Thank you very much for the instructions! :)
I made this tonight from variegated yarn while listening to the political convention of my choice. (I won't say which because it says just below that there is a "be nice" comment policy and I don't want to start a firestorm.) Thanks again.
Very clear. Incredibly easy. I am surprised I hadn't even heard of it before. Five stars for a project any little kid can do. I have some plastic I was going to recycle. I am going to fish it out and cut out a disk. Friendship bracelets to match every outfit! (Where is my yarn?!)
and I love the ending... 'may I have a hand please' *hand appears*
... *skitters off to go make bracelets*
thanks so much for teaching us :D