ProFlux wire-grid polarizers are made of mirror quality aluminum patterned on glass wafers. The size and structure of the grid makes it very susceptible to physical damage and contamination. Because of the fragile nature of the wire-grid, it is necessary to follow proper handling guidelines. Damage to the wire-grid from mishandling is not covered in the warranty and Moxtek will not refund parts damaged from mishandling. Follow the handling and care information below to prevent damage to the wire-grid surface ensuring consistent performance.