These electrical-insulating rubber gloves meet NFPA 70E Voltage Class 1 standards. Voltage Class 1 protects workers up to 7500VAC. 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.