As footholds, the entire set is slopey though they can still be used on walls up to 35 degrees overhanging, keeping in mind that these are the kind of foothold you find on advanced-level boulder problems. We love them on our 25-degree wall, around corners, and on volumes.
A few of the holds in the set have dishes on them to force precise pressure from your shoe. I often wish I had a slipper on rather than an edging shoe when boulder problems have these holds.