The first is the collar canvas.

Design and materials

If you describe the design of the roller worship in principle, then they consist of three elements. The first is the collar canvas. The second is a box in which the canvas is placed when it is twisted into a roll. The third element is guide profiles. For a more visual presentation of this design, one can imagine a piece of fabric several meters long, which is twisted into a roll, and then straightens again. So, approximately, the roller. Of particular interest in this design is the protective canvas. It is assembled from individual planks and in this sense resembles the design of the blinds. But only remind and nothing more.