White Opaque Plexiglass Acrylic Sheet - 1/4" (6mm) Thick. Nominal size saw cuts. Allow + or - 1/8" tolerance in width and length. The term acrylic refers to a synthetic plastic material. Paper masking on both sides. This white opaque acrylic sheet is perfect for, signage, displays, covers, computer cases and many more DIY projects. We can cut many different custom shapes, laser cuts and silk screening.