Pack of 6 A4 Magnetic Acrylic Block - 30mmThe 30mm depth is the specification that transforms a sign holder into a piece of furniture. Standard acrylic holders use 1mm to 2mm of styrene. This block is fifteen times thicker. Two panels of 15mm optical grade acrylic create a solid slab with the visual mass of heavy crystal, catching ambient light through polished edges and refracting it across the desk surface. On a property marketing desk beside a development brochure, on a showroom counter