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.040 aluminum designed to endure harsh elements and environments both indoors and out; corrosion-proof and UV resistant, pre-drilled mounting holes and radius corners where applicable .040 Polystyrene plastic is durable and moisture/weather resistant; ideal for indoor and outdoor use, pre-drilled mounting holes and radius corners where applicable Self-adhesive vinyl is flexible, resilient, and 4 mil thick; strong adhesive backing, resistant to weather, moisture and corrosive conditions for indoor and outdoor use. Adheres to most clean, dry, surfaces SKU: SS-N-971321 (7" x 10", Aluminum), SS-N-971323 (7" x 10", Plastic), SS-N-971324 (7" x 10", Vinyl Press-On), SS-N-971331 (10" x 14", Aluminum), SS-N-971333 (10" x 14", Plastic), SS-N-971334 (10" x 14", Vinyl Press-On), SS-N-971341 (14' x 20", Aluminum), SS-N-971343 (14' x 20", Plastic), SS-N-971344  (14' x 20", Vinyl Press-On) Price per sign.