VERTICAL Double Sided Ad/Sign Holder. This BottomLoading Ad Frame is made to LOAD from the bottom for easy insertion of paper. This picture frame is ideal for restaurant sign holder or for the desktop. This economical frame is made with one piece construction and designed to hold two sheets of paper for a double sided view from back to back. Available in two different materials: Clear Styrene (More Affordable Option) and Clear Premium Acrylic (Higher Quality Option).