No Diving (Humor) Sign (18 x 12 Inches) (White Styrene Plastic) This sign is a lightweight, durable, weatherproof outdoor sign. Printed on White Styrene Plastic! Signs are digitally printed with UV resistant inks to prevent fading. All four corners of our plastic signs are pre-drilled with 1/4 inch grommets pre-installed for easy mounting. Recommended for mounting on walls or other flat surface mounting.