Thanks Rel unfortunately those arnt the U's that Im looking for. There was a company back in the 70s and 80s that made superior martial arts weapons. It was called Dolan sports. Dolan invented and patented the U-swivel nunchaku, Its almost impossible to find real Dolan U swivels, he died a while back, and no one continued his work. The chuks in that picture are the newer imitation u swivels, they dont work as good as Dolans. Dolans also made other superior weapons.
Thanks to Derek I recently received a set of Dolans U-Swivel's they are unbelievable, anybody who prefers chained chuks should look into getting a set (good luck) Once you swing a pair of Dolan U's you will wonder why swivel chuks are so popular. Imagine having a set of chain chucks that the bearings wont ever break! They are amazing. Derek knew how bad Ive been wanting some, and the next thing you know Im getting a package from Los Angeles. He sent me the gift of a lifetime. Derek's the man, he knows basically everything there is to know about the history of nunchaku.