This National Marker Company caution signage instructs workers or employees to wear safety glasses at all times. The sign can be used at a construction site, industrial facility or another other workplace where there are chances of eyes getting damaged or injured. The caution signage has the legend âCAUTION - SAFETY GLASSES MUST BE WORN AT ALL TIMESâ printed in legible font to give more readability to the message. The sign is UV resistant, chemical resistant and graffiti proof. It has yellow text on a black base and black text on a yellow base in bold. The rectangular caution sign complies with OSHA standards and has an NMC Sign Muscle coating to protect the text against fading, scratches, scuffing, mold, and moisture.