The Petrified Edges are a group of crimps and jugs that give you just enough texture to bite into, while not being too rough on your hands.
My board is 45 degrees and I max out around V7 or so on most standardized boards, and my finger strength isn't very high relative to others climbing at my grade. These holds are vicious little incut crimps that will provide challenge at my level indefinitely. The worst holds in this set (three finger half pad?) are quite difficult for me at my wall angle without really good feet. The best (tight four finger 3/4 pad?, shown below on wall) are usable in a variety of situations at my level. The texture is quite abrasive out of the box but I personally prefer that to slick holds.
Overall, really nice quality holds that are great low profile low surface area incuts for filling in space on your board without getting in the way. I would recommend for boards of ~30 degrees or less unless you're climbing upwards of V7 or are a high angle crimp master.
This is a nice set of incut crimps that are mostly around half a pad but range all the way up to a full pad, 3-4 fingers. As a V6-7 climber, these are great on my 35° wall, but tend to be a bit too difficult at 55°. My main complaint is how rough the texture is. However, I hit them all gently with sandpaper and that took off the sharpest bits and that made them much more comfortable. A great set of holds for the price.