Warning Sauna/Steam Room Regulations Sign (Measuring 12 x 18 Inches on White Styrene Plastic) (Sauna Room) This sign is a lightweight, durable, weatherproof outdoor sign. Material is of 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.