Promotional mailing device

A direct mail article comprising:

• a transparent semi-rigid mailing cylinder enclosing an interior volume and having a first end and a second end, having a uniform diameter dimension from said first end to said second end, a uniform internal circumference dimension and a length dimension measurable from said first end to said second end and an internal curvature;
• a printed quadrate promotional enclosure having a first side and a second side, a top edge and a bottom edge, and having a width dimension substantially equal to the length of said cylinder and having a height dimension less than said uniform internal circumference dimension and greater than said diameter dimension;
• whereby, when said promotional enclosure is inserted in said tube for mailing, said enclosure is deformed to substantially conform to the internal curvature of the tube and defining a gap between said top edge and said bottom edge allowing visual access into said interior volume.