This is a GAM GamFloor Roll (48" x 100' / 1.2 x 30.5 m), (Pewter).
With GamFloor you can change the color of your studio floor at will in minutes. It's easy to install. You can lay down 1,000 square feet of this durable 2.8 mil vinyl in only 30 minutes and then peel it up and toss it in 1/3 that time! GamFloor can be installed vertically or horizontally on concrete, vinyl, wood, painted surfaces, glass and plaster surfaces, just to name a few.