What type of playability do my Cleveland CG4 irons have?

I just heard about these 3 different types of playability irons could have. The first and easiest clubs to hit are like super game improvement clubs with a thick sole and heel, the 2nd is like gamer improvement clubs which is less thick near the sole and heel, and the hardest clubs to hit is something like the professional grade that offers a lot of feedback from the club and has like razor thin heel and sole. So which category do my Cleveland CG4's fall in to?What type of playability do my Cleveland CG4 irons have?
I would say they fall into the 2nd category, game improvement clubs. They offer forgiveness but at the same time they're not overly hard to hit.