You are looking at Cassette Roller Banners
Cassette roller banners are roller banners with the added benefit of having an interchangable cassette containing the printed banner. Cassette roller banners are really useful where changes are often required in the content. There are quick change cassettes that are placed in the roller banner stands. When ever the graphics have to be changed, all the user has to do is to order a replacement for the cassette and change it. There is no need to return the entire banner stand. Not only that, there is no need to waste time either. A library of roller banners graphics can be built too without the need to buy multiple roller banner stands. This also saves a lot of money while giving the flexibility of changing graphics often.
