Genuine Pellon 911FF charcoal (gray or off black) fusible interfacing. It says featherweight on the bolt, but I think it is a little stiffer than that. I'd say it is medium weight. 20" wide x 18" long Buy multiple quantities and I will send you the full uncut length. Buy a quaintly of 2 and I will send you 1 yard, for example. This will be folded into an envelop and mailed first class letter to keep the price down for you. Should be as quick as a letter from CA.