Tough - Chemically inert polyolefin labels resist most organic solvents and caustic agents. They adhere to most plasticsx2020 glass and metals without cracking peeling or degradingTemperature-Resistant - from -196C to 100C Tough-Spots(R) withstand boiling water baths moderate oven temperatures (150C) autoclaving and extreme freezer temperatures (liquid and vapor phase nitrogen)Specially Designed - Label sheets are specially top-coated to readily accept laser printing. Heat-resistant stay-flat sheets will not jam in laser printersIdeally Sized - fits a variety of microcentrifuge tube tops cryovial caps and lids as well as many other laboratory container caps lids and coversColor Coding - 3/8 in. (9.5 mm) and 1/2 in. (13 mm) diameter Laser Tough-Spots(R) are available in White Blue Green Orange Red and Yellow