4 mil. Double Matte Erasable Inkjet Film A premium inkjet film that provides a 20% faster reprint speed than its lighter 3 mil. counter part 7923D. A durable and archivable 4 mil. film specially coated for superior monochrome lines and fine details, and even light color ink line coverage. Outstanding line formation while drying quickly with excellent erasability. Core Size - 2.0" Caliper - 4.0 mil Opacity - 53% Smoothness - 75