Any for of string will work it just depends on how you want to present it.

I used the shoelace that came with the pro-flight DVD, This was the tool I used to practice and found it worked very well.
I attended a lecture with Gregory Wilson in the UK and acquired some velvet cord, Its a lot thicker and I found that it was harder to get through the smaller rings.
I do know that some sewing shops sell thinner velvet cord for pennies.

It amazes me that there is a thread asking if a shoelace can be used in a ring on string routine!

What happened to experimenting and thinking for yourself. Just take your shoe off and try it.

Now that's " Magicians helping Magicians "

Great advice !!!!!

I'm thinking that my Ring Leader didn't even come with the velvet string. I use round black shoelaces. I really like them because they lend themselves well to other effects as well.
KJ

I have the original (complete with VHS video instructions and have the black velvety cord. I don't remember where or who but someone told me the DVD version comes with a plain ribbon (as the supplier quit making the velvet cord). That being said, I guess any string would work but the original material, in my opinion has an elegance that adds to the routine and patter.