Schaller STM TOM-Style Bridge C Reverse

The saddles are roller shaped. But don't roll with the motion of the string. They only roll when the strings are off and you are adjusting string spacing. Only barely better for tuning stability than an normal tune o matic bridge, definitely not worth paying the premium for unless you really want to have your strings set to a non standard spacing.
Plus one of the "roller" saddles was frozen in place on the one I received. So string spacing couldn't be adjusted. Im sending mine back. I might consider buying a roller bridge that actually rolls. The description should make this clear to customers.