When you think about Playdoh, the material yields to the pressure when you squish it; such is the design style of the Squished Pinches. A distinct squished bulge on both sides of the hold creates the incut.
The incuts in Set #1 range from 1/4" to 1/2" deep. Set #1 feels V1 on vertical walls, V2 on 25-degree walls, and V4 on 45-degree walls.
Set #1 is the easiest to grip in this series, with Set #3 the hardest.
You may also be interested in these other sets of Squished Pinches: