The made-to-measure roller blind is the most well-known and functional internal darkening product. They consist of an aluminum roller on which the fabric is wound, which can be filtering or darkening. The tent is moved thanks to a chain mechanism. The filter roller blind has the characteristic of letting light filter through the room, without neglecting the privacy of those inside. A particular type of filtering fabric is the screen, which is designed to let the light pass through as much as possible, while keeping prying eyes away.