1) The disk is twice as thick, holding thread or cord more securely, giving you better tension control of your braids.
2) The center hole is slightly larger, improving control of manipulating the braid.
I found this disk so much better than what is currently on the market that I decided to carry them in my store. Try one, and like the intrepid NFB customers who already have, you will be back for more when you need a second for a second ongoing project or your friends want them.