Hey Ckzch,
Those slopers are comfortable, and you probably could pinch the two smaller ones.
The two larger ones at the back are both about 12-13" long and about 8 or 9" wide. And the ridge of the left one is fairly aggressive only encorage the climber to "feel" around. I love indoor holds that can acheive a sense of adventure, meaning that you dont know exactly whats the best spot or how to even use the hold, until you get to it. I mean everyone probably has a really good idea of what they're doing, but its cool when you're climbing inside and then someone else grabs the same hold alittle differently and suddenly the light bulb goes off!
Cheers