Tarifold, Inc. D291 Desktop Reference Starter Set, 10 Pockets, 5 Tabs Two viewing sides per pivoting pocket. Expandable to 30 pockets with TFI-W291units (sold separately). Material(s): Metal Compartment Types: Wire-Reinforced Pocket Rack Features: Snap-On Index Tabs Tarifold, Inc. Desktop Reference Starter Set with Display Pockets. Two viewing sides per pivoting pocket. Two viewing sides per pivoting pocket. Expandable to 30 pockets with TFI-W291units (sold separately).