The footholds in this set stand 3/4" to 1" off the wall. This hold size is not intended for children's climbing walls or tennis shoes; they are designed for commercial climbing shoes. With a commercial climbing shoe on, this size of foothold will challenge a beginner on a vertical wall. They are excellent gateway holds for teaching footwork.
What you can expect from these shapes is a realistic texture of granite. The incuts to the shapes are neutral to slightly incut, making them best suited for low-angled walls such as vertical to 25-degrees overhanging. On a 25-degree wall, an advanced climber can use many of these as V7+ micro-crimp handholds.
On a 45-degree overhanging wall, the set challenges your core. You might find it difficult to stab your foot back on when you cut loose. Check out the 20 Super Small Granite Steep Wall Feet for a positive version.