Well that's cool. Like I said, there is still a degree of personal preference and what feels right for you. for me personally, I first heard that you have to measure your forearm, which I did, from my wrist to my elbow, which came up to 12 inches. Now, I can use 12 inch nunchaku without any real issues, but they sometimes feel like they don't reach far enough. Then I made my own pair of 14 inch nunchaku, and they feel MUCH better. Of course now, the chain I have on them is too long, so they still don't feel totally right, but the longer ones are easier and feel better to me. To each his own, I say.