DURABLE PLASTIC. Signs use 55 mil thick HDPE (high density polyethylene) and can last up to 2 years outside. Signs have a 100% recyclable base
Lynch Sign 18 in. x 12 in. Caution Sign Printed on More Durable, Thicker, Longer Lasting Styrene Plastic PL-28 - The Home Depot
PLEASE USE OTHER DOOR -> - American Sign Company
Hale Pet Doors for Walls: Premium Quality for Your Pet's Ultimate Comfort
SmartSign “Be Careful - Keep This Door Closed” Sign 10 x 14 3M Reflective Aluminum: : Industrial & Scientific
Caution Maintenance Work In Progress Standing Floor Sign
Caution: High Pressure Air - Wall Sign
Automatic Door Keep Back 3 Feet Label, SKU: S-5089
Brady 10 in. x 14 in. Plastic Caution Watch Your Step OSHA Safety Sign 25611 - The Home Depot
Be Cautious When Opening The Door Sign By SmartSign 10 x 14 Plastic: : Industrial & Scientific