TapeCase Yellow Prismatic Reflector Film Converted by 3M 3431 is an engineer-grade reflective sheet metal product for commercial and non-critical traffic signing applications such as "No Parking" and "Restricted Parking". This product provides lasting performance for up to seven years and improves brightness day and night at the brightness of pearl engineer quality. Made with environmentally friendly, solvent-free processes, this product produces lower VOC emissions, energy consumption and waste products.