The Not Safe to Ride tag is designed to be used when maintenance is being performed. The mechanics safety flag is made with a durable, hi-visibility red polyester web which is stain and fade resistant for years of trusted use. The mechanics safety flag is a low cost reminder that could potentially save you hundreds of dollars in unnecessary repairs. Easily attaches with elastic cord. WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov This warning is being provided to comply with the State of California's Proposition 65.