That's a good question, you could send a message to Sir or Sleeping Dreamer via the messaging system on Eden to ask them, both users have reviewed them.
Does any one know how quick and easy these cuffs are to get on and off?
They're pretty easy to use. They do lock though, so if you have them locked it'll take a bit longer to get them off. And you also have to take into consideration that there are two separate straps.