54 inch...came in this morning to see it unspooled in a pile on the floor... At the end of the day I just open the pinch rollers so they don't get a flat spot and just let the material drop. There was never any sense taking it off the printer because we would just use it in the morning. Never did I think this would happen, let alone with a half roll. I tell you it is a great workout that only gets harder as you get more tired. Plus side is I think it is straighter that it was factory rolled.