The Edge Zero is a double locking tremolo system developed and produced by Ibanez, introduced to the market in 2008. It's design is based on the 2003 ZR tremolo.
Do note that the Edge Zero's pivot is based on knife edges while the ZR2 relies on ball-bearings. Both of them were introduced at the same time along with the SynchroniZR. These three tremolos make use of the Zero Point System: