What's the smallest quantity that can be purchased? I only need to cover one small window (12"24")? Is this an adhesive that can easily be taken off if needed?

All of our materials are sold by the foot (12") as a continuous roll and can be purchased in any increment of feet. In most cases it is very easy to remove adhesive films. Peel away the film from one corner and pull the film from the glass. If any adhesive remains on the glass it can easily be removed with a spray of soapy water and a single edge razor blade. Blades cannot be used on plexiglass or polycarbonate sheets to remove film.