Deluxe 1/4” thick risers are clear acrylic and are flame polished. The sizes listed are the outside dimensions. We can custom make them in colors and we can make risers in all sizes. Order in increments of 4 for best shipping. Risers are priced as individual items. Plastics Plus has the largest variety of risers and infinite possiblities of what we can make If you need help designing a modified rise which may not be much like a riser when completed just call us toll free 877 858 5751 and we will help you get the perfect display for a reasonable price.