To explain this hold, envision a vertical wall, which is 90 degrees. The place where you attach a hold to this volume measures 30 degrees. It's math beyond that to understand what angle the landing area yields when on steeper terrains. The hold itself adds a nice variety as most of the hold has been designed to be a sloper. It's a way for the hardcore to have some fun in vertical terrain.
This volume will accept holds that have a 4" footprint or less. That means most medium and large grips will fit. Of course, all small holds will fit comfortably.