Wahl's industrial safety warning labels protect against skin burns when affixed to potentially hazardous surfaces. When the self-adhesive bright yellow 1.5" diameter reversible temperature indicator reaches its calibrated temperature of about 122°F (50°C), which is skin burn temperature, A BRIGHT RED HAND APPEARS WHICH SAYS "HOT". When the temperature cools to normal, the verbal message will disappear and change back to its original solid non-indicating position. Hot Hands Temperature Warning Safety Labels are priced, sold, and shipped in packages of 50 labels. Labels indicate at 122°F (50°C), and withstand a maximum temperature of 194°F (90°C).