DURABLE PLASTIC: 'Pool Closed For Maintenance' signs use 55 mil thick HDPE (high density polyethylene) which is much better than comparable styrene that becomes brittle and breaks. Signs can last up to 2 years outside. EASY INSTALLATION: Signs have pre-punched and pre-cleared mounting holes for easy installation. Signs mount to walls, fence posts and doors, and can be used indoors or outdoors. Semi-flexible plastic allows the sign to conform around slight curves. DIGITAL PRINTING: Signs are digitally printed in high resolution for high-end finish and over coated for additional protection. MADE IN USA: All components are made in the USA and offer superior quality. PACK CONTENTS: One 10 x 14 inch blue and white Sign.