Edge-to-edge Pb versions are available for sheet sizes for that lack a VACUPAC version. A specific advantage of the edge-to-edge is its double-sided edge. This feature makes it possible to place the film against or between elements of a work piece easily and accurately. Opening the edge-to-edge packaging is as simple as tearing open the wrapper using the thread included for this purpose, then removing the film via the long side. The Pb edge-to-edge version is designed for exposures with energies higher than 100 kV and isotope.