Haven't properly tested them, so be careful using them, can't tell when or where they brake.

They feel much stronger than regular shaped knuckles, yet as an attached photo of simulation, finger separators are probably the first to fail.

It was designed for rather small hands, but you can scale it in slicer for your liking 

knuckles_sharp_edges - model without chamfer on finger holes, easier to print, but edges need to be smoothed otherwise it's uncomfortable to use.