The Loaf Pinches are shaped to have a "bread loaf-like" profile. The sides of the holds run parallel to each other, forcing the climber to pinch.
Set #3 has subtle neutral incuts, meaning you can pinch these or you can't. The widths range from 3-7/8" size, which is wide for most adults. 3-1/2" feels wide for women and youth-sized hands.
You'll also find with this set that each side of the pinches differs from the other but ever so slightly.
You can expect Set #3 to feel in the V3 range on vertical walls, V4 on 25-degree walls, and V7+ on 45-degree walls.
Set #1 is the most positive, and Set #3 is the least positive.
You may also be interested in these other sets of block pinches: