These electrical-insulating rubber gloves meet NFPA 70E Voltage Class 00 standards. Voltage Class 00 electrical-insulating gloves are the lowest class and protect workers up to 500VAC. Workers should use a voltage class rating that matches the requirements set by their work site. Type I electrical-insulating gloves are not ozone-resistant. Type II electrical-insulating gloves resist cracking and degradation caused by exposure to high levels of ozone that can be found in high-pollution areas.