Invisible closed zippers
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Gathered curtain tape in different widths.
50-meter packages, it is a resistant ribbon that, sewn to the top of a curtain, is used to hang it from a guide, which, by pulling the cords that are incorporated, the ribbon is collected creating a gather in the curtain.
You need approximately 2.10 meters of curtain tape to cover 1 linear meter of wall, window or gap to be covered.