Displays2go Outdoor Sidewalk Sign for Vinyl Adhered Graphics and Text Not Included, 20 Inch w x 35 Inch h x 27 Inch d, Dual-Sided Sandwich Board for Indoor and Outdoor Use - Cheap Polystyrene Plastic (NPABRD39) Lightweight design is portable. Plastic surface allows for quick change messages. White exterior is a neutral background for colorful advertisements and promotions to jump off. This white polystyrene plastic pavement sign is designed for both indoor and outdoor display. Displays2go SKU#: NPABRD39