@honcho is indeed correct. I am really not overly into Bondage now as to me it is a waste of valuable time where one can begin the torture which to me is the main event. However, I have experienced enough over the years to know what works best.
Ironically I was only handcuffed with actual police metal cuffs once. To further add it the irony, it was done in jest by a friend who was the only female police officer in town at the time and I found the metal cuffs to be quite uncomfortable and confining as indeed they are intended to be.
Rope can also be overly uncomfortable as it can cause a burning sensation. It may seem strange to some, but where Bondage is concerned it important for the victim to be reasonably comfortable and in a safe position. One must also be bound in a safe manner such that one would not be able to slip, slide, and be injured in the process. That is one reason why I never really got involved in the tying up aspect of it all. Plus I was never good with rope and knots etc.
Consequently, leather restraints or those made of a soft material and fastened with Velcro™ are the easiest not only to work with, but the kindest to the victim, and the kinder one is to the sub the longer he can enjoy the pleasures of Bondage if that is in fact what he enjoys most.