I am selling these interlocking grappling mats from greatmats.com. They are 1.5 thick and are 2 sided, black and grey. There are 25 mats and they create a 10.5x10.5 area. The grey side has never been used. With two kids beginning to lift weights and run the treadmill we no longer have a use for them. We paid $525 but will sell them for $225. If you have any questions please contact me, .