These are slightly softer than the Flexi-Roll mats that aree used by most schools.
I bought a 1.6" commercial mat from their ebay store (10' x 21') & then bought 6 of the 4' x 6' x 1.5" mats to go along the side so I would have a 16' x 21' mat area.
The 4' x 6' mats are made of different type of foam (black closed cell versus a white closed cell for the commercial mats) which is slightly softer. You sink in a little more on them & can tell it when transitioning between the 2. In reality I probably wouldn't have noticed it if the 2 mats weren't adjacent to each other & taped together.
Not that this is a bad thing either. I prefer to practice breakfalls & throws on the softer surface.
Regardless, they are top quality Dollamur products & you can't go wrong with them.
If I can ever figure out how to post pictures on this site I'll do a write up & comparison of the 2 mats in the gear forum.