The product photo shows interlocking tile system of 24" x 24"tiles however in this case this item is a single piece roll out mat 4' x 6'. It works well for large pieces of equipment such as ellipticals or bikes. Sadly I was looking more for a tile system to build out a larger mat for free weights ect.
1. It's not grey. It's black. 2. It's one piece, not tiles that fit together, like pictured. 3. It does not have a carpeted top. It's foam with a diamond texture, like a truck toolbox. Totally disappointed, and not at all what I ordered. Sears didn't do anything but offer a return either. Buyer BEWARE!! :(