Why Buy Sunscreen Roller Blinds? Also known as 'Magic Screen Blinds', 'One Way Blinds' & 'Privacy Blinds' they create a one-way view so during the day you can see out but others cannot see in. The magic screen effect is created by weaving vinyl & polyester together in an open weave which allows light through from the side with the strongest light source i.e. the sun during the daytime. This product has a 3% open weave to allow a clear view of the outside on a sunny day. Please note that in the evening when it's dark outside & light inside this one-way view will be reversed so please ensure that your evening privacy is protected.