Premium Acrylic Sign Holder 8.5 x 11 Inch, Extra Thick 3 mm for Maximum Durability, Extra-Stable Wide Base, Double-Sided, Set of 6 3 MM THICKNESS MEANS ENHANCED STRENGTH AND DURABILITY  Made with extra thick, crystal clear, professional grade 3 mm acrylic for exceptional strength. Take note: If an acrylic product doesn't list its thickness, you don't know what you're getting. At Hamilton Rickard, we carefully seek out and pay for materials that meet our exacting standards, and that we are proud to offer our customers. A WIDE BASE MEANS SUPERIOR STABILITY -- An extra-wide 4-inch base makes this upright display especially stable. No falling down on the job! DOUBLE-SIDED DISPLAY MEANS TWICE THE VISIBILITY -- This bottom-load, closed top vertical stand protects your insert and lets you display your message on two sides. Double your message space and your visability compared to a single-sided slanted holder. TOP QUALITY MEANS IT'S ECONOMICAL -- Unlike cheaper brands, you will buy these ONCE and use them forever. We want delighted customers, even if they never need to buy another sign holder again! SCROLL DOWN TO LEARN MORE ABOUT WHAT MAKES US THE BEST - And why, when your priority is the HIGHEST QUALITY in materials and design, Hamilton Rickard delivers. 100% GUARANTEED.