ALUSION™ - LARGE CELL AL-25.4-LG-1S - One Side Open. The shiny silver skin of the large cell is removed and the cells underneath are exposed. This creates a surface that has been described as appearing like an “aluminum sponge”. This is a low density material resulting in large, deep open cells. Cymat Technologies Ltd, based in Toronto, Canada, is an innovative materials technology company that has the exclusive worldwide rights for producing lightweight aluminum panels using Alusion™